J. E. Hasbun's Research Statement

General Research Experience

The doctoral dissertation (1987) dealt with the studies of local environment effects in alloys. An effective medium theory was applied to investigate the effects of different alloy compositions on the system's density of states. The approximation went beyond a popular theory known as the Coherent Potential Approximation (CPA) to include electron correlations. Impurity effects and level splittings due to local interactions were investigated. The theory was developed for a simple cubic alloy model and later extended to zinc blende semiconducting systems. The major part of the thesis work was published. In other work, a ten-band theory for semiconductors was used to obtain impurity splittings in a perturbational fashion. In the area of liquid metals, it was shown that the effective medium approximation of Roth (1974) is equivalent to the earlier theory of Klauder (1961) and also gives the CPA in the random alloy limit. A 1989-1990 postdoctoral appointment introduced me to transport studies in GaAs/AlGaAs heterojunction systems at 77 Kelvin using a linear theory due to Ting and Nee (1986). In a later work the simplest version of a non- linear theory due to Xing and Ting (1987) was applied. Studies of energy levels in a heterojunction potential using variational wave functions have also been made. A simple model of transient velocity suitable for device modeling was also introduced.

An investigation of the plasmon contribution to resonances in the electronic conductivity in a two dimensional heterojunction system set the stage for future work. Here a memory function method was employed. Calculations have been made to investigate the more complete version of the Xing and Ting nonlinear equations for transport. A comparison of two very important approximations was made, one a simple and the other a more involved version of the Xing-Ting approach. The inclusion of alloying effects and interface roughness to transport properties in a InGaAs/InAlAs heterojunction system was made and compared successfully with experimental data. Studies of the electronic transport in two dimensional quantum wells in the presence of electric and magnetic fields, including scattering mechanisms due to impurities and phonons has been made. A comparison with two different sets of experimental data available in the literature has been carried out. In recent months, Professor ShiLiang Ban of the University of Hohhot, China visited the physics department to perform theoretical work of mutual interest. This has led to various papers submitted for publication dealing with low dimensional semiconductor systems as described below.

Description of  Interests in Research

Under the action of an electric field, electrons in two dimensional modulation doped heterostructures grown by molecular beam epitaxy can achieve high velocities. In these systems electron mobilities on the order of 106 cm2/V.s , and even higher, have been reported in the literature. The electric field experienced by fast moving electrons in micron size semiconductor devices can be quite high. Thus, there is a need to understand the transport behavior of electrons in ultra small devices under high electric fields.

Much impetus for transport studies in miniature electronic devices has been provided by the need of electronic components with low cost, small dimension, fast response, low energy dissipation, and high reliability. Components with such characteristics play a vital role in the areas of defense, computer technology, and optical communications. Most realistic investigations of high field transport have been based on the phenomenological Boltzmann equation and the Monte Carlo method. However, a non-Boltzmann approach to high field transport was introduced in the late 80's. This is an analytical many body Green's function approach to hot electron transport. It is a powerful method in which transient and steady state properties such as electron temperature and velocity can be obtained as a function of electric and magnetic fields in closed form. Furthermore, the method is applicable in the linear and non-linear field regimes. Hasbun is currently interested in investigating the motion of electrons in quantum well systems in the presence of both, electric and magnetic fields. A two dimensional quantum well is created when, for example, a thin layer of semiconductor material with a given energy gap is grown on top of another semiconductor material with a higher band gap. A third layer, of the higher band gap material, is placed on top of the middle layer. The final product is like a semiconductor sandwich wherein the electrons are trapped in one dimension (z direction) but are free to move in the other two dimensions (x,y) due to the mismatch between the band gaps of the materials involved. There exits a potential well which confines the electrons. When an electric field is applied in the x direction, the electrons move in its direction. The speed of these electrons as a function of time, temperature, and electric field has been studied in the past using the above mentioned theory. When a magnetic field is applied in the z direction, the electrons experience additional quantization in the y direction due to a harmonic potential created by the magnetic field in a Landau gauge manner. This magnetic field quantization is responsible for the Landau levels which in turn are responsible for oscillations in the electronic resistance under B fields or magnetoresistance. This work has recently been accomplished. There is one aspect of these calculations that needs to be revisited; i.e., the lattice temperature problem. This refers to the question of the energy transfer due to an interaction between the moving electrons and the vibrating atoms in the host crystal. Thus far, due to the complicated nature of the problem, this interaction has been ignored. A preliminary work has shown that it is possible to perform a perturbation calculation about the lattice temperature in order to investigate this effect. These calculations showed that while the electronic temperature does vary in a non- classical way, it does not seem to affect the magnetoresistance significantly.

Regarding the collaboration with Professor Ban, it should be mentioned that he is an expert in the phonon interaction. Thus, we performed investigations dealing with the effects of the phonon interaction to the energy levels associated with realistic two-dimensional (2D) heterojunction potentials. We have performed investigations of various scattering mechanisms associated with phonons in two (2D), three (3D), and quasi-two dimensions (Q2D). Quasi-two dimension refers to very thin semiconductor structures in which electrons do not quite behave as if they were located in a 3D or a 2D environment. Further work has been carried out on the inclusion of an impurity in a heterojunction. Some of the work we have carried out has been applied to semiconductor systems made of II-VI materials rather than the usual II-V systems of the periodic table. The II- VI systems investigation helped us realize a new theory to treat this kind of system. This new theory is a fortunate spin off the previously mentioned CPA of Hasbun's thesis. Interest in quantum mechanical tunneling led us to develop a novel approach to tunneling which rivals the best available theories of tunneling. Finally, Professor Ban was a visiting scholar of physics. His work here became part of his Ph.D. thesis in Inner Mongolia University, Hohhot, China.

The above theory applicable to quantum tunneling, J. Hasbun was able to employ the Landauer method in order to obtain the conductance of a two and a three barrier well system. The calculations have involved the self-consistent Hartree potential and a comparison with a more sophisticated Wigner function approach has been made. The significance of this research is that such systems exhibit resonant tunneling and negative differential resistance (NDR). The triple barrier system definitively develops higher peak to valley current in the NDR region in agreement with earlier experiments.

Other work has involved the investigation of the energy structure in a quantum wire with cylindrical geometry as well as studies of semiconductor band structures for the purpose of obtaining the density of states using a Green's function approach.

Javier E. Hasbun also involves students in research. Many presentations and several publications of his have students as authors and co-authors as shown below.

Publications

Books

2008       “Classical Mechanics with MATLAB Applications,”  Javier E. Hasbun (Jones & Bartlett Learning, 2008, ISBN: 10:0-7637-4636-3; 13:978-0-7637-4636-0) (https://www.amazon.com/Classical-Mechanics-MATLAB-Applications-Javier/dp/0763746363/ref=sr_1_1?dchild=1&keywords=hasbun&qid=1596476156&sr=8-1)<

2010        “A First Course in Computational Physics,” Second Edition, Paul L. DeVries and Javier E. Hasbun (Jones & Bartlett Learning, 2010)  (https://www.amazon.com/First-Course-Computational-Physics/dp/076377314X/ref=sr_1_19?dchild=1&keywords=hasbun&qid=1596476156&sr=8-19)

2018        “Classical Mechanics with MATLAB Applications,” 2nd Edition, Javier E. Hasbun  https://www.amazon.com/Classical-Mechanics-Applications-Javier-Hasbun/dp/1722299282/ref=tmm_pap_swatch_0?_encoding=UTF8&qid=1533306499&sr=8-3, (2018, ISBN: 1722299282, 13: 978-1722299286).

2020        “Introductory Solid State Physics with MATLAB Applications,” Javier E. Hasbun  and Trinanjan Datta,  CRC Press, Taylor Francis Group, NY (2020)  (https://www.routledge.com/Introductory-Solid-State-Physics-with-MATLAB-Applications/Hasbun-Datta/p/book/9781466512306)

Journal Articles

1) "Tight Binding Studies of GaxAl1-xAs" J. Hasbun, V. Singh, and L. Roth Phys. Rev. B 35, 2988 (1987).
2) "Local Environment Effects on the Density of States and Substitutional Impurities in Random Alloys" J. Hasbun and L. Roth, Phys. Rev. B 37, 2829 (1988).
3) "Perturbational Method for Impurity Level Splitting in the Random GaAs1-cPc Alloy System" J. Hasbun and L. Roth, J. Appl. Phys. 65, 4801 (1989).
4) "One-dimensional Model of a Liquid Metal in the Effective-Medium Approximation in the random Limit" J. Hasbun, Phys. Rev. B 40, 4164 (1989).
5) "Variational Method in a Heterojunction" J. Hasbun, Phys. Rev. B 43, 5147 (1991).
6) "Application of a Transient Transport Hot Electron Green's Function Approach to a Two Dimensional Model of a GaAs/AlGaAs Heterojunction" J. Hasbun and T. Nee, Phys. Rev. B 44, 3125 (1991).
7) "On a Transient Transport Theory Applied to a AlGaAs/GaAs Heterostructure" J. Hasbun, J. Phys. Chem Solids 53, 459 (1992).
8) "A Model for Transient Velocity with Overshoot", J. Hasbun, J. Phys. Chem. Solids, 53, 1305 (1992).
9) "Resonant Structure in the Conductivity of Two Dimensional Heterojunction Systems using a Memory Function", J. Hasbun, J. Appl. 75, 270 (1994).
10) "Electric Field Transport In A Two-Dimensional AlGaAs/GaAs Heterostructure", J. Hasbun, J. Phys. Chem. Solids 56, 791 (1995).
11) "Classical Mechanical Model for the Electron-Impurity Interaction in a Semiconductor", M. Boleman (student), and J. Hasbun, Georgia Academy of Science, Georgia J. Sci 52, No.2 (1994).
12) "Electron Mobility in two-dimensional modulation-doped In1-xAlxAs/In1-yGayAs alloy systems", J. Hasbun, Phys. Rev. B, 52, 11989 (1995).
13) "Damped Motion of a Charged Particle in the presence of Electric and Magnetic Fields", J. E. Hasbun, Eur. J. Phys. 17, 290 (1996)
14) "A Simple Scheme for the Numerical Evaluation of Nearly Singular Integrals", George C. John, J. E. Hasbun, and Vijay A. Singh, J. Comp. Phys. 11, pp (1997)
15) "Simple Illustrations of the Coherent Potential Approximation". Bulletin of the Indian Association of Physics Teachers, 15, 39 (1998)
16) "Magnetotransport Study In Semiconductor Quantum Well Systems", J. E. Hasbun, J. Phys. Chem. Sol. 59, 1597 (1998).
17) "Optical-phonon scattering in quasi-two-dimensional heterojunction systems, J. Hasbun, S. Ban, Phys. Rev. B 58, 2102 (1998).
18) "The Ground State of a Simple Harmonic Oscillator using a Variational Monte Carlo Method", S. Pottorf, A. Puzder, M. Chou, and J. Hasbun, Proceedings of the University of West Georgia Celebration of Scholarship Undergraduate Research Fora 1, 7 (1998).
19) "Understanding the Size of the Earth", Jason Hay, B. Powell, and J. Hasbun, Proceedings of the University of West Georgia Celebration of Scholarship Undergraduate Research Fora 1, 12 (1998).
20) "A Thermal Analog of a Classical Center of Mass System Problem: An Undergraduate Experiment", J. Hasbun and G. Keller, Engineering Educator - Hewlett Packard, http://www.home.agilent.com/upload/cmc_upload/All/exp75.pdf
21) "Interface Polarons in a Realistic Heterojunction Potential", S. L. Ban and J. Hasbun, Eur. Phys. J. B 8, 453 (1999).
22) "Donor level in a Quasi-Two Dimensional Heterojunction System", S. L. Ban and J. Hasbun, Solid State Commun, 109, 93 (1999).
23) "Bound Polaron in a Polar Semiconductor Heterojunction", S. L. Ban and J. Hasbun, Phys. Rev. B. 59, 2276 (1999).
24) "The Simple Harmonic Oscillator Ground State Using a Variational Monte Carlo Method", S. Pottorf, A. Puzder, M. Chou, and J. Hasbun, Eur. J. Phys. 20, 205 (1999).
25) "A numerical method for quantum tunneling", S. L. Ban, J. Hasbun, and S. X. Liang, Journal of Acta Scientiarium Universitatis NeiMongol", 31, 25 (2000).
26) "A novel method for quantum transmission across arbitrary potential barriers", S. L. Ban, J. Hasbun, X. X. Liang, J. Lumin. 87-89, 369 (2000).
27) "Investigation of Laser Fundamentals Using a Helium-Neon Laser", M. Jackson, D. Bauen (student), and J. Hasbun, Eur. J. Phys., 22, 211 (2001).
28) "Method for investigating tunneling in arbitrary potentials", J. Hasbun and S. L. Ban, Recent Devel. In Physics 3, 31 (2002).
29) "A model for the motion of a kinetic mobile" Brian Bockelman (Advisor: J. Hasbun), accepted, J. Undergraduate Res. Phys. (2002)
30) "Conductance in double quantum well systems" J. Hasbun, J. Phys.: Cond. Matt. 15, R143 (2003).
31) "Demonstrating the Central Limit Theorem Using Matlab," Kemo Dassau and J. E. Hasbun, GJS 63, No.3, 133 (2004).
32) "On double barrier quantum well conductance effects due to exchange and correlation," J. Hasbun, Phys. Stat. Sol. (b) 242, 1453 (2005).
33) "Computation in classical mechanics," T. Timberlake and J. E. Hasbun, Am. J. Phys. 76, (4&5) , 334 (2008).
34) "Striated Muscle Regulation of Isometric Tension by Multiple Equilibria," Henry G. Zot, Javier E. Hasbun, and Nguyen Van Minh, PlosOne Journal, p1-10, V4, No. 12, e8052 (2009): http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0008052
35) "Second-Chance Signal Transduction Explains Cooperative Flagellar Switching," Henry G. Zot, Javier E. Hasbun, and Nguyen Van Minh, PlosOne Journal, p1-8, V7, No. 7, e41098 (2012).
http://www.plosone.org/article/info:doi/10.1371/journal.pone.0041098
36) "Dynamical analysis of calcium model of muscle at rest," J. E. Hasbun, N. V. Nguyen, and H. G. Zot, J. Nonlin. Evol. Equations and Applications, v2013 (2), p11-22 (2013). http://www.jneea.com/?2013-2
37) "The Nucleon-Core Interaction: A Nuclear Physics Simulation Suitable for Classroom Use", Benjamin Hogan and Javier Hasbun, Georgia Journal of Science, Vo. 71, No. 3, p144-157 (2013).
38) "Simple Experiments and Modeling of Incandescent Lamp Spectra," Austin B. Kerlin, Javier E. Hasbun, and Ajith L. DeSilva, Georgia J. Sci. V73, No2-4, pp 160 (2015).
39) "The Millikan Oil Drop Experiment: A simulation suitable for classroom use," Ben E. Hogan and Javier E. Hasbun, Georgia J. Sci. V.74, No.2, Article 7, pp 1-13 (2016). (http://digitalcommons.gaacademy.org/gjs/vol74/iss2/7/)
40) "Model for the electrolysis of water and its use for optimization," Roger Laszorz and Javier E. Hasbun, Georgia J. Sci., V 84, No.2, Article 11, pp 1-10 (2016). (http://digitalcommons.gaacademy.org/gjs/vol74/iss2/11)
41) "Calculating the Sun's Photospheric Temperature, an Undergraduate Physics Laboratory," Austin B. Kerlin, L. Ajith DeSilva, Shea Rose, and Javier E. Hasbun, V. 74, No.2, Article 13, pp 1-11 (2016). (http://digitalcommons.gaacademy.org/gjs/vol74/iss2/13)
42) "Enhanced troponin I binding explains the functional changes produced by the hypertrophic cardiomyopathy mutation A8V of cardiac troponin C.," H. G. Zot, Javier E. Hasbun,C. A. Michell, M. Landim-Vieira, and J. R. Pinto, Arch. Biochem. Biophys., V601, pp97-104 (2016).
43) "X-ray spectroscopy study of local microstructures in CdSe quantum dots prepared by UV photolithography,” Ajith DeSilva, Sunil Dehipawala, Raghuveer Gadipali, and Javier E. Hasbun, AIP conference Proceedings, 1764, 030006 (2016)
44) "Modeling Ca²⁺-Bound Troponin in Excitation Contraction Coupling,” Henry G. Zot and Javier E. Hasbun, Frontiers in Physiology, V7, Art. 406, pp 1-10 (2016)
45) "Broad absorption natural dye (Mondo-Grass berry) for dye sensitized solar cell," L. de Silva, P. K. D. D. P. Pitigala, A. G. Parker, R. Landry, J. E. Hasbun, V. Martin, T. M. W. J. Bandara, and A. G. U. Perera, J. Mater Sci.: Matter Electron, Vol. 28, No. 11, pp 7724-7729 (2017).
46) "Enhancing student performance in introductory physics in topics related to electricity and magnetism through the use of voluntary workshops," L. A. DeSilva, Adam Pullen, and J. E. Hasbun, Eur. J. Phys., V39, 035702 (10pp) (2018).
47) "On the optical path length in refracting media," J. E. Hasbun, Am. J. Phys V86, No. 4, pp 268-274 (2018).
48) "A Nonlinear Approximate Solution to the Damped Pendulum Derived Using the Method of Successive Approximations", GJS, V.76, No.2, Art.9 (2018). (https://digitalcommons.gaacademy.org/gjs/vol76/iss2/9/)
49) "Modeling Temperature Change Of A Computer Component Using An Rlc Circuit," Kelly S. Ford and J. E. Hasbun, GJS, Vol. 77, No. 2, Article 13 (2019). (https://digitalcommons.gaacademy.org/gjs/vol77/iss2/13)
50) "Demonstration of a Distributed Bragg Reflector for Polyvinylcarbazole and Cadmium Sulfide Layers: Modeling and Comparison to Experimental Results," Javier E. Hasbun and L. Ajith DeSilva, GJS, Vol. 78, No. 2, Article 10. (2020).
(https://digitalcommons.gaacademy.org/gjs/vol78/iss2/10)
51) "Mechanical contribution to muscle thin filament activation," Henry G Zot, P Bryant Chase, Javier E Hasbun , Jose R Pinto, J Biol Chem 2020 Nov 20; 295(47):15913-15922. doi: 10.1074/jbc.RA120.014438 (https://pubmed.ncbi.nlm.nih.gov/32900850/)
52) “Generalized Weisskopf-Wigner model of triboelectroluminescence", Lok C. Lew Yan Voon, Javier E. Hasbun, Morten Willatzen, Zhong L. Wang, Eco-materials journal V3, Issue 2, e12086 (2021) https://doi.org/10.1002/eom2.12086 (https://onlinelibrary.wiley.com/doi/epdf/10.1002/eom2.12086).
53) "Erratum: A NON-LINEAR APPROXIMATE SOLUTION TO THE DAMPED PENDULUM DERIVED USING THE METHOD OF SUCCESSIVE APPROXIMATIONS [Georgia Journal of Science, Vol. 76, No. 2, Article 9]," J. E. Hasbun, Georgia Journal of Science, Vol. 79, No. 3, Article 1. (2021) Available at: https://digitalcommons.gaacademy.org/gjs/vol79/iss3/1
54) "On chain models of contact electrification," J. E. Hasbun, L. C. L. Y. Voon, and M. Willatzen, J. Phys.: Cond. Mat. V34, p135501 (2022) Available at: https://iopscience.iop.org/article/10.1088/1361-648X/ac47de/pdf
55) “Application of a diatomic molecule model potential to a series of homo- and heterodiatomic molecules”, Dorien E. Carpenter and Javier E. Hasbun, Georgia Journal of Science, V81, No.2, Art.6, (2023) Available at https://digitalcommons.gaacademy.org/cgi/viewcontent.cgi?article=2576&context=gjs
56) ”Optimization of a ball’s launch in sports”, Andrew C. Smith and Javier E. Hasbun, Georgia Journal of Science, accepted.

Papers Presented (Abstracts, Posters published)

1) Theses: "Study of Local Environment Effects in Alloys", O. No. DA8715352, Diss. Abs. Int. 49, 1085-B (1987); Advisor: Laura M. Roth.
2) "Effects of Local Environment on Impurity Levels and Density of States in Random Alloys", J. Hasbun and L. Roth, APS, Bull. 32, 657 (1987).
3) "Transient Transport Studies in AlGaAs/GaAs Heterojuntions" J. Hasbun and T. Nee, APS Bull. 35, 818 (1990).
4) "Investigation of Transient Electron Transport in GaAs/AlGaAs Heterojunction Using a Linear Theory", J. Hasbun APS Bull. 35, 2358 (1990).
5) "Variational Energy Levels for a Heterojunction Potential", J. Hasbun, APS Bull. 36, 814 (1991).
6) "Non-linear Transient Transport In Semiconductor Devices Using a Model Free of Energy Relaxation Coupling", J. Hasbun, APS Bull. 36, 2750 (1991).
7) "Plasmon Dispersion for a Two Subband Model of a GaAs/AlGaAs Heterojunction Potential", J. Hasbun, APS Bull. 37, 532 (1992).
8) "Phenomenological Model for the Short Time Velocity of Electrons in Semiconductor Devices" Georgia J. Sci., 50, 42 (1992)
9) "Conductivity Study of Two Dimensional Systems", J. Hasbun, APS Bull. 37, 1647 (1992).
10) "Transient and Steady State Transport in 2-d systems", J. Hasbun, APS Bull. 38, 81 (1993).
11) "Classical Mechanical Model for the Relaxation Time of an Electron Travelling Near an Impurity", M. Boleman (student), and J. Hasbun, Georgia J. Sci. 51, 44 (1993).
12) "Motion of Hot Carriers in a Two Dimensional System", J. Hasbun, APS Bull., 38, 2160 (1993).
13) "Electronic Mobility In An InAlAs/InGaAs Heterojunction", J. Hasbun, APS Bull. 39, 398 (1994).
14) "Instructive Application of Lagrangian Mechanics To The Damped Motion Of A Charged Particle In Electric and Magnetic Fields", J. Hasbun, Georgia J. Sci. 52, 54 (1994).
15) "Interfacing An IBM PC", Terry Hudgins (student), J. Hasbun, Georgia J. Sci. 52, 52 (1994).
16) "Low Field Transport In A 2D Heterostructure System", J. Hasbun, APS Bull., 39, 1810 (1994).
17) "Compositional Dependence of the Electronic Transport in an InAlAs/InGaAs Heterostructure", J. Hasbun, APS Bull., 40, 254 (1995).
18) "Simulation of a one dimensional multi-spring-mass system", Jesse B. Hines (Student) and J. Hasbun, GJS 53, 47 (1995).
19) "Electronic motion within two short high speed interacting wires", J. Hasbun, GJS 53, 45 (1995).
20) "Electronic Motion in an InAlAs/InGaAs Alloy Heterostructure", J. Hasbun, APS Bull. 40, 2078 (1995).
21) "Magnetotransport in an AlGaAs/GaAs/AlGaAs Quantum Well", J. Hasbun, APS Bull. 41, 419 (1996).
22) "A numerical technique suitable for evaluating nearly singular integrals", J. Hasbun, GJS 53, 47 (1995).
23) "Mineral composition of Pre-Corbin Metamorphic Rocks using a PC interfaced point count system", Shawn S. Pottorf (student), Brian B. Marshall (student), J. Hasbun, and R. Sanders, GJS 54, 54 (1996).
24) "Petrology of Metamorphic Rocks enclosed in the Corbin Granite", B. Marshall (student), S. Pottorf (student), R. Sanders, and J. Hasbun, GJS 54, 42 (1996).
25) "Electronic Transport in a Quantum Well in the Presence of Electric and Magnetic Fields", J. E. Hasbun, APS Bull. 41, 1659 (1996).
26) " Tunneling in Quantum Mechanics with transfer Matrices", Darron L. Robbins and J. Hasbun, GJS 55, 88 (1997).
27) "Understanding the Electronic Resistivity in Metals", Shawn Pottorf and J. Hasbun, GJS 54, 88 (1997).
28) "A Non-Newton's Law of Cooling Experiment", J. Hasbun, GJS 54, 89 (1997)
29) "Magnetoresistance Study in a GaAs/InGaAs/GaAs Delta-Doped Quantum Well", J. E. Hasbun, APS Bull. 42, 429 (1997).
30) "Optical Polaron Effect on the Electronic States of a Heterojunction Potential", S. L. Ban, and J. Hasbun, APS Bull. 42, 1789 (1997).
31) "Electric and Magnetic Field Dependence of the Electronic Resistivity in 2D Quantum Well Systems", J. Hasbun, APS Bull. 42, 1789 (1997).
32) "Impurity States in Realistic Heterojunction Potentials", S. Ban and J. Hasbun, APS Bull. 43, 914 (1998).
33) "Magneto-Hot-Electron Temperature in a Quantum Well", J. Hasbun, APS Bull. 43, 107 (1998.
34) "The Coherent Potential Approximation Exemplified", J. Hasbun, GJS 56, 30 (1998).
35) "Optical phonons influence on the impurity state of a donor in a heterojunction potential", S. Ban and J. Hasbun, GJS, 56, 30 (1998).
36) "The simple harmonic oscillator ground state using a Monte-Carlo method", Shawn Pottorf, A. Puzder, M. Chou, and J. Hasbun, GJS 56, 61 (1998).
37) "Size of the Earth: an old method and a new method" J. Hay, B. Powell, and J. Hasbun, GJS 56, 30 (1998).
38) "Impurity States in Realistic Heterojunction Potentials", S. Ban and J. Hasbun, APS Bull. 43, 107 (1998).
39) "A New Method for Investigating Tunneling in Arbitrary Potentials", J. Hasbun, APS Bull. 43, 1611 (1998).
40) "Impurity Energy Level in the Presence of an Interface", J. Hasbun, GJS 57, 63 (1999).
41) "Transmission Studies of Random Potential Barriers", S. Pottorf, and J. Hasbun, GJS 57, 63 (1999).
42) "Study of Interference by a Monte Carlo Method", J. Hay and J. Hasbun, GJS 57, 63 (1999).
43) "On Tunneling in Arbitrary Interface Potentials with Variable Effective Mass", J. Hasbun, APS Bull. 44, 451 (1999).
44)"Solution of a Heat Conduction Problem Using a Center of mass Analogy", J. Hasbun, B. Hojjatie, and G. Keller, XX Southeastern Conf. On Theor. Mech. Pine Mt. GA, April 16-18, p121 (2000).
45) "On Light Measurements", L. Arnold and J. Hasbun, GJS 58, 42 (2000)
46) "Vibrating String Coupled with a Simple Pendulum", Ryan Schwartz and J. Hasbun, GJS 58, 43 (2000).
47) "Mobility Investigation in a Double Barrier Quantum Well", J. Hasbun, APS. Bull 45, 292 (2000).
48) "Solution of a Heat Conduction Problem Using a Center of Mass Analogy", J. Hasbun, B. Hojjatie, and G. Keller, SECTAM XX Conf. on Theoretical Mech., HT-45, 121, 2000
49) "Thermal Characterization of Pulp Stock Using a Calorimetric Method", B. Hojjatie, J. Hasbun, and G. Keller, Tappi Pulping Conf., 2000.
50) "Conductance in a Double Quantum Well", J. Hasbun, APS Bull. 46, 114 (2001)
51) "One-Dimensional, Convective-Conductive Heat Transport Through a Porous Medium", J. Hasbun and J. Mayer, GJS 59, 64-65 (2001).
52) "Alpha Decay Model Proposal Using a Non-Square Potential Model Near the Nucleus", Leighton Arnold and J. Hasbun, GJS 59, 64-65 (2001).
53) "Analogy of Black Body Radiation to Sound", Ryan Schwartz and J. Hasbun, GJS 59, 64-65 (2001).
54) "A model for the motion of a kinetic mobile", Brian Bockelman, and J. Hasbun, GJS 60, 80 (2002).
55) "A random amplitude forced harmonic oscillator", Eshwar Stalin and J. Hasbun, GJS 60, 80 (2002).
56) "The Moon's distance from Earth by a parallax method", Daniel Serrano and J. Hasbun, GJS 60, 81 (2002).
57) "Conductance Investigation in a double barrier quantum well system" J. Hasbun, APS Bull 47, 914 (2002).
58) "On a numerical solution of the Boltzmann transport equation", J. Hasbun, GJS 61, 63 (2003).
59) "Experiment on the response of RC circuits to AC signals", Daniel Serrano (replaced by Elton Freeman), G. Keller, and J. Hasbun, GJS 61, 62 (2003).
60) "Exchange and Correlation Effects in a Double Barrier Quantum Well", J. Hasbun, APS. Bull. 48, 888 (2003).
61) "Demonstrating The Central Limit Theorem Using MATLAB," Kemo Dassau, and J. E. Hasbun, GJS 62, 30 (2004).
62) "Open Source Physics Applications In Java, " Maxwell Perkins, and J. E. Hasbun, GJS (2004).
63) "Application Of A Yukawa Core Potential Model Of Alpha Decay, " Elton Freeman, and J.E. Hasbun, GJS 62, 32 (2004).
64) "Theory Of Alpha Tunneling, Does The Alpha Particle Really Exist Inside The Nucleus," Elton Freenan, George Keller, and J.E. Hasbun, GJS 62, 32 (2004).
65) "Experimentation On Rocket Engines, " Dmitriy Plaks, and J.E. Hasbun, GJS 62, 33 (2004).
66) "Liquid Cooling Of Semiconductors By The Use Of Commercial Heat Sinks, " Nicolas Wagner, and J.E. Hasbun, GJS 62, 33 (2004).
67) "Energy Level structure in a Quantum Wire of Cylindrical Geometry, " J. Hasbun, APS. Bull. 49, U11.003 (2004).
68) "A Boltzmann Transport Simulation Using Open Source Physics," J. Hasbun, APS. Bull. 49, W38.007 (2004).
69) "Using MATLAB to Simulate the Dynamics of a Three Body System," Heidi L. Lesser, and J. E. Hasbun, GJS 63, No. 1, 29 (2005).
70) " Simplified Water Balloon Launcher," L. Andrew Block and J.E. Hasbun, GJS 63, No. 1, 29 (2005).
71) "Simulation of m Electrons Interacting with n Impurities in an External Electric Field in Nano-Devices," Max F Perkins and J. E. Hasbun, GJS 63, No. 1, 30 (2005).
72) " Computerized Underdamped Harmonic Oscillator Experiment," Clayton W. Huff, and J. E. Hasbun, GJS 63, No. 1, 31 (2005).
73) " A Convenient General Angle Formula For The Period of a Pendulum," J. E. Hasbun, GJS 63, No. 1, 57 (2005).
74) "Variational Wavefunctions for a Quantum Wire of Cylindrical Geometry," J. Hasbun, APS. Bull. 50, No.1, 419 (2005).
74) "Classroom Physics Applications Using The Open Source Physics (OSP) Library," J. Hasbun, APS. Bull. 50, No.1, 1069 (2005).
75) "Visualizing the Correspondence Principle through Harmonic Motion," Matthew F. Herron and J. E. Hasbun, GJS 64, 31 (2006).
76) "Modeling the Galaxy's Rotation Curve," Daniel S. Serrano and J. E. Hasbun, GJS 64, 31 (2006) and APS. Bull. 51, No. 8, 35 (2006).
77) "A Simple Variational Wavefunction for the Ground State of a Quantum Wire," J. E. Hasbun, GJS 64, 32 (2006).
78) "Computational Physics in the Undergraduate Curriculum," J. E. Hasbun, APS. Bull. 51, No. 1, 452 (2006).
79) "Classical Mechanics with Computational Physics in the Undergraduate Curriculum," J. Hasbun, APS Bull. 51, No.8, 46 (2006).
80) "Computational Physics in a Classical Mechanics Text," J. Hasbun, APS Bul. 52, No. 1, 201 (2007).
81) "Accurate Speed of Sound Measurements Using PASCO Equipment," Jeffrey J. Croxall and J. Hasbun, GJS 65, No.1, 26 (2007).
82) "On the Period of a Pendulum versus Initial Angle," J. Hasbun, GJS 65, No.1, 52 (2007).
83) "Computation in Classical mechanics," (Poster) J. Hasbun, Computational Physics for Upper-Level Physics Programs AAPT conference, Davidson College (2007).
84) "Integrating Computation into the Curriculim," (Poster) J. Hasbun, AAPT Bull Session BV, Greensboro, NC, pp 66. (2007).
85) "Large Swinging Angles and a Pendulum Period," Christian Sanchez J. Hasbun, GJS, 66, No. 1, 23 (2008).
86) "Simple Model of a Diatomic Molecule," J. Hasbun, GJS, 66, No. 1, 23 (2008).
87) "On the Forced Harmonic Oscillator in Classical Mechanics", (Poster) J. Hasbun, Physics Research and Education: Computation and Computer Based Instruction Gordon Conference, Bryant University, Smithfield, RI (2008).
88) "Computation in Classical Mechanics", (Poster) J. Hasbun and T. Timberlake, Physics Research and Education: Computation and Computer Based Instruction Gordon Conference, Bryant University, Smithfield, RI (2008).
89) "Simulating a Water Droplet's Evaporation," J. E. Habun, GJS, 67, No. 1, 54 (2009).
90) "Singular Function Integration in Computational Physics," APS Bull. 54, No. 1, 480, L29.00012, (2009).
91) "Using Open Source Physics in Visualizing Physics Concepts," J. E. Hasbun, STEM Conference - University of West Georgia (2010): /~asfacts/STEM/DetailedAgenda.pdf
92) "Molecular Model for the Cooperative Activation of Molluscan Muscle by Calcium," H. G. Zot, J. E. Hasbun, N. Van Minh, 49th Annual Meeting of the American Society of Cell Biology, 1772, B151 (2009).
(93) "Model for Transient Activation of Isometric Force by Calcium," Henry G. Zot, Javier E. Hasbun, Nguyen V. Minh, Biophysical Journal, p151a, V98, No.3 (2010).
(94) "Equilibrium Model for Cooperative Activation of Muscle by Calcium," Henry G. Zot, Javier E. Hasbun, Nguyen V. Minh
Biophysical Journal, p151a-152a, V98, No.3 (2010).
(95) "Computational Physics in Undergraduate Solid State," APS Bull. 55, No.2 J4200013 (2010).
(96) "An Analysis Of The Penetrability Of Athabasca Oil Sands," Austin Kerlin, J.E. Hasbun, Ben de Mayo, and Peter Lauzon, GJS Vol. 68, No.1, 22-23 (2010).
(97) "A Study Of Resonance In A Planar Material," Anton Hud*, Javier E. Hasbun, GJS 68, No.1, 22-23 (2010).
(98) "Accurate Measurements Various Dynamics Of Sound Using Pasco Equipment," William I. Floyd IV and J.E. Hasbun, GJS Vol. 68, No.1, 22-23 (2010).
(99) "Solving The Time Evolution Of A Wavepacket," Javier E. Hasbun, GJS Vol. 68, No.1, 46-47 (2010)
100) "Common Characteristics Found by Fitting Divergent Datafrom TnC Mutations," Javier E. Hasbun, Nguyen Van Minh,
Ryan S. Lee, Jonathan P. Davis, and Henry G. Zot, Biophysical Society 55th Annual Meeting (2011); http://www.biophysics.org/
101) "Low Frequency Oscilations in a Planar material," Anton Hud and, Javier E. Hasbun, Georgia Academy of Science, Vol. 69, p52 (2011).
102) "Effects of Pressure on Sound Waves," William I. Floyd IV and J. E. Hasbun, Georgia Academy of Science, Vol. 69, p53 (2011).
103) "Computing Band Structures in Undergraduate Solid State," J. E. Hasbun, March Meeting, American Physical Society, APS Bull, Vol. 56, No1 (2011).
104) "Variational Calculations for Hydrogen in Introductory Solid State," APS Bull. T37.00011, Volume 57, Number 1 (2012).
105) "On The Optimization Of Electrolysis Of Water," Roger Lascorz and J. E. Hasbun, pp 26, Georgia Journal of Science, Vol. 70 No. 1 (2012).
106) "Effects Of Pressure On Sound Waves," William I. Floyd IV and J.E. Hasbun, pp 26, Georgia Journal of Science, Vol. 70 No. 1 (2012).
107) "Working With The Lennard-Jones Potential In Solid State," Javier E. Hasbun, pp 61, Georgia Journal of Science, Vol. 70 No. 1 (2012).
108) "On the electron gas heat capacity in undergraduate solid state," J. E. Hasbun, v58 (1), Baltimore, March Meeting of the APS, (2013).
109) "Visualizing the cubics' band energies and Fermi surfaces in solid state physics," J. E. Hasbun, GJS v71 (1), p68 (2013).
110) "Simulation of a Vibrating Beam," Daniel Sanchez Carreterro and J. E. Hasbun, GJS v71 (1), p30 (2013).
111) "A nuclear physics simulation suitable for classroom use," Benjamin Hogan and J. E. Hasbun, GJS v71 (1), p30 (2013).
112) "Numerical Calculation of the Electronic Heat Capacity," Javier E. Hasbun, 3rd ANACAPA society meeting, Georgia Regents University, Augusta, GA December (2013).
113) "Second chance mechanism explains duell time distributions of myosin an dynein," H. G. Zot, J. E. Hasbun, and N. M. Minh, 58th Annual meeting of the Biophysical Society, San Francisco CA (2014).
114) "Modeling incandescent bulb spectra," Austin B. Kerlin, J. E. Hasbun, and Ajith DeSilva, GJS v72 (1) p29 (2014)
115) "Broadening the reach of scientific education: The Milikan Oil Drop Experiment - A simulation," Benjamin E. Hogan and J. E. Hasbun, GJS v72 (1) p29 (2014)
116) "Modeling the solar spectrum," Marcus Davis, Austin kerlin, Ajith DeSilva, and J. E. Hasbun, GJS v72 (1) p30 (2014)
117) "Modeling the temperature behavior of an incandescent lamp," J. E. Hasbun, GJS v72 (1) p56 (2014)
118) "Simple Experiments and modeling of incandescent lamp spectra," Austin Kerling, Ajith DeSilva, and Javier E. Hasbun, Council of Undergraduate Research, Spring 2014.
119) "Reflectivity Calculations on Hybryd-layered CdS/PVK Distributed Bragg Reflectors," J. E. Hasbun and A. DeSilva, Bull. Amer. Phys. Soc., Vol. 60, No.1 (2015)
120) "Reflectivity Study on a type of Bragg Reflector," J. E. Hasbun and A. DeSilva, GJS, Vol. 73, No.1 p55 (2015).
121) "A Simulation and Modeling of Reflectivity for a Two Period Bragg Reflector," Jared W. Thacker, J. E. Hasbun, and A. DeSilva, GJS, Vol. 73, No.1 p28 (2015)
122) "A Statistical Mechanical Basis of Cellular Motility," Henry G. Zot, Javier E. Hasbun, Nguyen Van Minh, Biophysical Journal, Vol. 110, Issue 3, p308a (2016). (http://www.cell.com/biophysj/fulltext/S0006-3495(15)02839-8).
123) "A8V Mutation of Cardiac Troponin C Enhances Troponin I Binding," Javier E. Hasbun, Henry G. Zot, Clara A. Michel, Maicon Landim-Vieira, Jose R. Pinto, Biophysical Journal, Vol. 110, Issue 3, p124a (2016). (http://www.cell.com/biophysj/fulltext/S0006-3495(15)01898-6).
124) "A Monte Carlo Calculation of the optical path length in simple systems," Javier E. Hasbun, Georgia J. Sci. V. 74, No. 1 (2016).
125) "Homemade diode for physics and electronics labs," T. King, J. Ajith DeSilva, and Javier E. Hasbun, Georgia Journal of Science, Vol 75, No. 1, article 90 (2017).
126) "Student led supplemental instruction to improve student success in classical mechanics," Joshua S. Buth and Javier E. Hasbun, , Georgia Journal of Science, Vol 75, No. 1, article 98 (2017).
127) “On calculating the optical path length in simple systems part II," Georgia Journal of Science, Vol 75, No. 1, article 94 (2017).
128) "On the optical path length in various media," J. E. Hasbun, New Orleans, LA, March Meeting of the APS, K12.00011 (2017).
129) "A nuclear physics simulation suitable for classroom use," Javier E. Hasbun, AAPT Winter meeting, Atlanta, GA 2/18-21, session AG, invited talk AG05 (2017).
130) "The use of the Euler-Cromer numerical method in classical mechanics," J. E. Hasbun, Vol. 76 (2018), http://digitalcommons.gaacademy.org/gjs/vol76/iss1/37
131) "Supplemental instruction in classical mechanics using computation," Justin A. Hill, and J. E. Hasbun, Vol. 76 (2018), http://digitalcommons.gaacademy.org/gjs/vol76/iss1/32
132) "Modeling temperature change of a computer component using an RLC circuit," Kelly S. Ford, and J. E. Hasbun, Vol. 76 (2018), http://digitalcommons.gaacademy.org/gjs/vol76/iss1/20
133) "Understanding mechanics with applications in MATLAB/Octave through peer-led workshops," Charles A. Zander, and J. E. Hasbun, Vol. 76 (2018), http://digitalcommons.gaacademy.org/gjs/vol76/iss1/42
134) "Using Monte Carlo and Self-consistency to solve Newton's 2nd Law," Boston, MA, March Meeting of the APS, K12.00011 (2019). (https://meetings.aps.org/Meeting/MAR19/Session/R18.12)
135) "Optical Trapping and its Modeling," J. E. Hasbun and S. K. Tripathy, GJS, Vol. 72 (2019), https://digitalcommons.gaacademy.org/gjs/vol77/iss1/123/
136) "Understanding Classical Mechanics through Peer Leadership," James C. Howard and J. E. Hasbun, GJS, Vol. 72 (2019), https://digitalcommons.gaacademy.org/gjs/vol77/iss1/130/
137) "A Numerical Approach to a Hanging Spring-Mass-Pendulum System," Zachary C. Paterson-Goss and J. E. Hasbun, GJS, Vol. 72 (2019), https://digitalcommons.gaacademy.org/gjs/vol77/iss1/113/
138) "Thin Filament Regulation Blends Thermodynamic and Mechanical Mechanisms," Henry G. Zot, P. Bryant, J. E. Hasbun, and J. R. Pinto, Biophys. Soc. J. Vol. 116, Issue 3, Supplement 1, 177A-178A (2019), https://www.cell.com/biophysj/pdf/S0006-3495(18)32251-3.pdf
139) "Computation and Project Infusion in Classical Physics," J. E. Hasbun, Innovations of Pedagogy Conf., 沙巴官网 (2019), https://issuu.com/rodmcrae/docs/iip-2019_conference-program/12
140 ) "Viscosity of a Crowding Medium Obtained Through Optical Trapping," James Howard, Javier E Hasbun, and Suvranta Tripathy, APS March meeting, D11.00011 (2020) (http://meetings.aps.org/Meeting/MAR20/Session/D11.11)
141) "A Simple Approach to Optical Trapping Analysis," Javier E Hasbun, James Howard, Zachary Patterson-Goss and Suvranta Kumar Tripathy, APS March Meeting, J26.00004 (2020) (http://meetings.aps.org/Meeting/MAR20/Session/J26.4)
142) "Calcium Regulates Average Time and not Velocity a Thin Filament Moves," Henry G. Zot, Javier E. Hasbun, Prescott B. Chase, and J. Renato D. Pinto, 64th ann. meet of the bio. soc, vol. 118, issue 3, supp. 1, pp258a, (2020) DOI:https://doi.org/10.1016/j.bpj.2019.11.1499 (https://www.cell.com/biophysj/pdf/S0006-3495(19)32432-4.pdf)
143) "A Theoretical Approach To Understanding The Effect Of Brownian Motion On A Particle Within An Optical Trap" Zachary Goss, Javier Hasbun, Georgia Journal of Science, Vol. 78, No. 1, Article 92. Available at: https://digitalcommons.gaacademy.org/gjs/vol78/iss1/92/
144) "Optical Tweezer viscosity measurement of glycerol-water mixture," Suvranta Tripathy, Javier E. Hasbun, and James Howard, Georgia Journal of Science, Vol. 78, No. 1, Article 113. Available at: https://digitalcommons.gaacademy.org/gjs/vol78/iss1/113
145) "Annular Solar Eclipse In Jaffna, Sri Lanka," L. Ajith DeSilva, Javier E. Hasbun, and K. Tennakone, Georgia Journal of Science, Vol. 78, No. 1, Article 98. Available at: https://digitalcommons.gaacademy.org/gjs/vol78/iss1/98
146) "Calcium Regulates Average Time and not Velocity a Thin Filament Moves," Henry G. Zot, Javier E. Hasbun, Prescott B. Chase, and J. Renato D. Pinto, vol. 118, issue 3, supp. 1, pp258a, (2020) DOI:https://doi.org/10.1016/j.bpj.2019.11.1499 (https://www.cell.com/biophysj/pdf/S0006-3495(19)32432-4.pdf)
147) "Quantum Theory of Contact Electrification," Timothy J. Perkins, J. E. Hasbun, L. C. Lew Yan Voon, M. Willatzen, and Z. L.Wang, Georgia Journal of Science, Vol. 79, No. 1, Article 28. (2021) Available at: https://digitalcommons.gaacademy.org/gjs/vol79/iss1/28
148) "Water-Glycerol Mixture Viscosity through Optical trapping," J. E. Hasbun, S. K. Tripathy; and James Howard, Georgia Journal of Science, Vol. 79, No. 1, Article 31 , James C. (2021) Available at: https://digitalcommons.gaacademy.org/gjs/vol79/iss1/31
149) "Mechanical Force Rather Than Strong Binding Intermediates Extends Activation of Regulated Actin," H. G. Zot, P. B. Chase, J. E. Hasbun, and J .R. Pinto, Biophys. J. 120: 60A., (2021), available at https://www.cell.com/biophysj/pdf/S0006-3495(20)31504-6.pdf
150) "Chain model of charge transfer and application to contact electrification," J. E. Hasbun, L. C. L. Y. Voon, and M. Willatzen, Chicago, March Meeting of the APS, D12.00012 (2022), https://meetings.aps.org/Meeting/MAR22/Session/D12.12
151) "Modeling Automata with Classical Mechanics," J. E. Hasbun, Georgia Journal of Science V80, No.1, Art. 23 (2022), https://digitalcommons.gaacademy.org/gjs/vol80/iss1/23/
152) "Simple Model of the Hydrogen Molecule," Dorien E. Carpenter, J. E. Hasbun, and L. A. DeSilva, V80, No.1, Art. 18 (2022), https://digitalcommons.gaacademy.org/gjs/vol80/iss1/18/
153) ”Optimization of a ball’s launch in sports”, Andrew C. Smith and Javier E. Hasbun, Georgia Journal of Science, V.81, No.1, Art. 96 (2023), https://digitalcommons.gaacademy.org/gjs/vol81/iss1/96/
154) “Application of a diatomic molecule model potential to a series of homo- and heterodiatomic molecules”, Dorien E. Carpenter and Javier E. Hasbun, V.81, No.1, Art. 95 (2023), https://digitalcommons.gaacademy.org/gjs/vol81/iss1/95/

Book Reviews Published

"How Do Nerve Cells Compute?" J. Hasbun, Comp. Sci. Eng. IEEE CS and AIP, May/June issue, p64-65 (2008).
"Unifying Two Popular-But-Seemingly-Dissimilar Platforms: Matlab and Java" Comp. Sci. Eng. IEEE CS and AIP, May/June issue, p2-3 (2012).

Work in Progress

1) Working with student on a NASA grant and finishing the publication associated with the actual paper of the optimization of a ball’s launch in sports, to be published.

Link back to: The Physics Home Page, to J. Hasbun's page

• jhasbun@westga.edu