Dr. Charles W. Myles |
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Texas Tech University College of Arts & Sciences Physics Professor Texas Tech University Engineering Physics Co-Director |  |
Mailing AddressDepartment of Physics Mail Stop 1051 Texas Tech University Lubbock, Texas 79409-1051United States | Contact Information |
Qualifications
Ph.D., Washington University in St. Louis, Physics, 1973.
M.S., Washington University in St. Louis, Physics, 1972.
B.S., University of Missouri-Rolla, Physics, 1969.
Expertise and Research Interests
Theoretical and computational materials physics, with emphasis on semiconductor materials
Thermoelectric materials; semiconductor clathrates and skutterudites
High electric field transport
Electronic properties of defects
Bandstructures and semiconductor alloys
Molecular dynamics and Monte Carlo computer simulations
Thermoelectric materials; semiconductor clathrates and skutterudites
High electric field transport
Electronic properties of defects
Bandstructures and semiconductor alloys
Molecular dynamics and Monte Carlo computer simulations
Other Expertise
Consultant to: Sandia National Labs (Albuquerque), Dept. of EE-Electrophysics, U. of Southern Cal.
Future Research
Project 1:
A theoretical/computational study of the properties of the relevant clathrates and skutterudite materials for thermoelectric applications is proposed. Calculations of the structural, electronic and vibrational properties of Type II clathrates based on Si, Ge, and Sn will be carried out using a first-principles method. The skutterudites will be studied later. In addition, empirical potential molecular dynamics will be used to calculate the thermal conductivity and other transport properties of the Types I and II clathrates which show the most promise for such applications.
Project 2:
Continue to investigate electrical breakdown in GaAs and other materials. The essence of the project is to continue modeling work on optically-triggered breakdown in GaAs and apply the ideas and techniques to begin a study of breakdown in other materials. The GaAs calculations include Monte Carlo calculations of the electron and hole distribution functions to implement collective impact ionization as a quantitative explanation for optically-triggered breakdown (this calculation is difficult because it includes electron-electron scattering).
A theoretical/computational study of the properties of the relevant clathrates and skutterudite materials for thermoelectric applications is proposed. Calculations of the structural, electronic and vibrational properties of Type II clathrates based on Si, Ge, and Sn will be carried out using a first-principles method. The skutterudites will be studied later. In addition, empirical potential molecular dynamics will be used to calculate the thermal conductivity and other transport properties of the Types I and II clathrates which show the most promise for such applications.
Project 2:
Continue to investigate electrical breakdown in GaAs and other materials. The essence of the project is to continue modeling work on optically-triggered breakdown in GaAs and apply the ideas and techniques to begin a study of breakdown in other materials. The GaAs calculations include Monte Carlo calculations of the electron and hole distribution functions to implement collective impact ionization as a quantitative explanation for optically-triggered breakdown (this calculation is difficult because it includes electron-electron scattering).
Industrial Relevance
Project 1: A broad, national effort is underway to synthesize and characterize new thermoelectric materials. Such materials are used for refrigeration where small size, the absence of moving parts, or environmental restrictions are important. This work will significantly enhance the materials physics understanding of the clathrates and will have an impact on the search for better thermoelectric materials.
Keywords
COS Keywords:
Condensed Matter, Dielectric Materials, Semiconductors, Solid State Electronics, Solid State Physics, Theoretical Physics, University - Industrial Partnerships.Additional Terms:
Clathrate Semiconductors, Electrical Breakdown, Photoconductive Switching, Skutterudite Materials, Thermoelectric Materials.Languages
(Reading, Writing, Speaking)
English: (Fluent, Fluent, Fluent)
French: (Functional, Basic, Basic)
Memberships
American Association of Physics Teachers
American Physical Society
Institute of Electrical and Electronics Engineers
Materials Research Society
Phi Kappa Phi
Sigma Pi Sigma
Sigma Xi
Honors and Awards
1997, Distinguished Alumnus,
Department of Physics,
University of Missouri-Rolla
1985, President's Excellence in Teaching Award
Texas Tech University
Previous Positions
1977-1978, Research Assistant Professor,
University of Illinois at Urbana-Champaign,
Physics and Materials Research Laboratory
1975-1977, Postdoctoral Research Associate and Instructor,
Swiss Federal Institute of Technology, Lausanne,
Physics
1973-1975, Postdoctoral Fellow,
Battelle Memorial Institute,
Columbus, Ohio
Funding Received
- Office of Naval Research: Materials for use in Pulsed Power Solid State Switches, $157,000, 6/1/93 to 5/31/96.
- Air Force Office of Scientific Research MURI Program: Compact Pulsed Power, $62,000, 2001 to 2006.
- Sandia National Laboratories: Simulations of High Field Transport in Semiconductor Switch Materials, $187,000, 1999 to 2005.
- Texas Higher Education Coordinating Board Advanced Research Program: Microscopic Physics of Semiconductor Switch Materials, $90,000, 1/1/95 to 8/31/98.
Publications
- Q. Shui, M.S. Mazzola, X. Gu, C.W. Myles, M.A. Gundersen (2004) Investigation of 4H-SiC MIS Capacitors with TiO2 and Al2O3 as Gate Insulators, Proc. 26th International Power Modulator Conference, 251-254 pages
- K. Kambour, H.P. Hjalmarson, C.W. Myles (2004) A Theory of Low-field, High-carrier-density Breakdown in Semiconductors, Proc. 27th International Conference on the Physics of Semiconductors, 1269-1272 pages
- C.W. Myles, J.J. Dong, O.F. Sankey, Theoretical Investigation of Carbon-Based Clathrate Materials, Physica Status Solidi B, in preparation, 2004
- X. Gu, Q. Shui, C.W. Myles, M.A. Gundersen, Comparison of Si, GaAs, SiC, and GaN FET-Type Switches for Pulsed Power Applications, Proc. 14th International IEEE Pulsed Power Conference, I, 362-365, Oct 2003
- Q. Shui, X. Gu, C.W. Myles, M.S. Mazzola, M.A. Gundersen, Simulations of a High Power 4H-SiC VJFET and its GaAs Counterpart, Proc. 14th International IEEE Pulsed Power Conference, I, 123-126, Oct 2003
- K. Kambour, H.P. Hjalmarson, C.W. Myles (Oct 2003) A Collective Theory of Lock-on in Photoconductive Semiconductor Switches, Proc. 14th International IEEE Pulsed Power Conference, 345-348 pages
- C.W. Myles, J.J. Dong, O.F. Sankey, Rattling Guest Atoms in Si, Ge, and Sn-based Type II Clathrate Materials, Phys. Stat. Solidi B., 239, 26-34, 01 Sep 2003
- K. Kambour, H.P. Hjalmarson, C.W. Myles, Theory of Optically-Triggered Electrical Breakdown in Semiconductors, Proc. 2003 IEEE Conference on Electrical Insulation and Dielectric Phenomena, 345-349, 2003
- C.W. Myles, J.J. Dong, O.F. Sankey, G.S. Nolas, C.A. Kendziora, Vibrational Properties of Tin Clathrate Materials, Phys. Rev. B, 65, 235208-1 - 235208-10, 2002
- C.W. Myles, B. Ha, Y.K. Park, Large Supercell Molecular Dynamics Study of Defect Formation in Hydrogenated Amorphous Si, Journal of Physics and Chemistry of Solids, 63, 1691-1698, 2002
- O.F. Sankey, J.J. Dong, C.W. Myles, Theoretical Study of Rattling Atoms and Their Influence on the Lattice Thermal Conductivity in Clathrate-Framework Semiconductors, Materials Research Society Symposium Proceedings, 691, G14.1 - G14.5, 2002
- C.W. Myles, J.J. Dong, O.F. Sankey, Cs ‘Rattlers’ in Sn-Based Clathrate Semiconductors, Proc. 3rd Motorola Workshop on Computational Materials Science and Electronics, 53 - 57, 2002
- X. Gu, C.W. Myles, A. Kuthi, Q. Shui, M.A. Gundersen, Gallium Arsenide and Silicon FET-Type Switches for Repetitive Pulsed Power Applications, Proc. 25th International Power Modulator Conference, 437-440, 2002
- G.S. Nolas, C.A. Kendziora, J. Gryko, J.J. Dong, C.W. Myles, A. Poddar, O.F. Sankey, Raman Scattering Study of Stoichiometric Si and Ge Type II Clathrates, Journal of Applied Phys., 92, 7225 - 7230, 2002
- J.J. Dong, O.F. Sankey, C.W. Myles, Theoretical Study of of the Lattice Thermal Conductivity in Ge Framework Semiconductors, Phys. Rev. Letters, 86, 2361-2364, 2001
- C.W. Myles, J.J Dong, O.F. Sankey, Structural and Electronic Properties of Tin Clathrate Materials, Phys. Rev. B, 64, 165202-1 - 165202-11, 2001
- S. Kang, C.W. Myles, Effect of Deep Level Impact Ionization on Avalanche Breakdown in Semiconductor p-n Junctions, Phys. Stat. Solidi A, 181, 219-229, 2000
- K. Kambour, S. Kang, C.W. Myles, H.P. Hjalmarson, Steady State Properties of Lock-on Current Filaments in GaAs, IEEE Transactions on Plasma Science, 28, 1497-1499, 2000
- C.W. Myles, W.-G. Li, Deep Levels Including Lattice Relaxation: First- and Second-Neighbor Effects, Journal of Physics and Chemistry of Solids, 61, 1855-1864, 2000
- J.J. Dong, O.F. Sankey, C.W. Myles, G.K. Ramachandran, P.F. McMillan, J. Gryko, Theoretical Calculations of the Thermal Conductivity in Framework Semiconductors, Materials Research Society Symposium, 626, Z6.1.1-Z6.1.6, 2000
- S. Kang, C.W. Myles, H.P. Hjalmarson, Monte Carlo Studies of Lock-On and Impact Ionization in GaAs, Proc. 12th International IEEE Pulsed Power Conference, II, 795-799, 1999
- K. Kambour, S. Kang, C.W. Myles, Steady State Properties of Current Filaments in GaAs, Proc. 12th International IEEE Pulsed Power Conference, II, 791-795, 1999
- H. Hjalmarson, G. Loubriel, F. Zutavern, D. Wake, S. Kang, K. Kambour, C. Myles, A Collective Impact Ionization Theory of Lock-on, Proc. 12th International IEEE Pulsed Power Conference, I, 299-303, 1999
Profile Details
Last Updated: 6/7/2006
COS Expertise ID #235793
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