Stephen W. Teitsworth
Associate Professor of Physics
Prof. Stephen W. Teitsworth's research centers on experimental, computational, and theoretical studies of deterministic and stochastic nonlinear electronic transport in nanoscale systems. Three particular areas of current interest are: 1) stochastic nonlinear electronic transport phenomena in semiconductor superlattices and tunnel diode arrays; 2) complex bifurcations associated with the deterministic dynamics of electronic transport in negative differential resistance systems; and 3) strategies for stabilizing negative differential resistance systems against the formation of space-charge waves.
Current Research Interests
- Current research centers on experimental, theoretical and computational investigation of rare fluctuation processes in noise-driven linear and nonlinear dynamical systems that are far from thermal equilibrium. Experimental platforms for studying these phenomena include bistable electronic transport systems such as semiconductor superlattices, tunnel diodes, as well as analog circuit networks. Theoretical work utilizes stochastic Lagrangian methods, while computational work focuses on the direct simulation of systems of linear and nonlinear stochastic differential equations.
Current Appointments & Affiliations
- Associate Professor of Physics, Physics, Trinity College of Arts & Sciences 1995
Contact Information
- 089 Physics Bldg, Durham, NC 27708
- Box 90305, Durham, NC 27708-0305
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stephen.teitsworth@duke.edu
(919) 660-2560
- Background
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Education, Training, & Certifications
- Ph.D., Harvard University 1986
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Previous Appointments & Affiliations
- Director of Graduate Studies in the Department of Physics, Physics, Trinity College of Arts & Sciences 2016 - 2019
- Associate Chair of Teaching in the Department of Physics, Physics, Trinity College of Arts & Sciences 2009 - 2012
- Associate Professor of Electrical and Computer Engineering, Electrical and Computer Engineering, Pratt School of Engineering 2009 - 2012
- Assistant Professor, Electrical and Computer Engineering, Pratt School of Engineering 1992 - 1996
- Assistant Professor, Physics, Trinity College of Arts & Sciences 1988 - 1995
- Recognition
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Awards & Honors
- Expertise
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Global Scholarship
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Research
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- Research
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Selected Grants
- Switching Dynamics of Electric Field Domains in Semiconductor Superlattices awarded by National Science Foundation 2008 - 2012
- DHB: Niches and Networks: Studying the Coevolution of Voluntary Groups and Social Networks awarded by National Science Foundation 2005 - 2007
- Development of Novel Photonic Nanostructures for Measurement in the Duke Femtosecond Terahertz Diagnostic Laboratory awarded by Lord Foundation of North Carolina 2002 - 2005
- Duke Terahertz Femtosecond Diagnostic Laboratory awarded by Lord Foundation of North Carolina 1999 - 2002
- Acquisition of a Variable Temperature Four-Circle X-Ray Diffraction System awarded by National Science Foundation 1999 - 2001
- Optoelectronics Laboratory Equipment Enhancement awarded by Lord Foundation of North Carolina 1998 - 1999
- Electron-localized Phonon Interactions in GaAs/AlxGal-xAs Quantum Well Structures awarded by National Science Foundation 1992 - 1996
- Electron-Localized Phonon Interactions in GaAs/AlxGa,-xAs Quantum Well Structures awarded by National Science Foundation 1992 - 1995
- Electron-Localized Phonon Interactions in GaAs/AlxGa- xAs Quantum Well awarded by National Science Foundation 1992 - 1995
- Publications & Artistic Works
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Selected Publications
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Academic Articles
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Teitsworth, Stephen, and John C. Neu. “Stochastic line integrals and stream functions as metrics of irreversibility and heat transfer.” Physical Review. E 106, no. 2–1 (August 2022): 024124. https://doi.org/10.1103/physreve.106.024124.Full Text
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Teitsworth, S. W., M. E. Olson, and Y. Bomze. “Scaling properties of noise-induced switching in a bistable tunnel diode circuit.” European Physical Journal B 92, no. 4 (April 1, 2019). https://doi.org/10.1140/epjb/e2019-90711-0.Full Text
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Gonzalez, Juan Pablo, John C. Neu, and Stephen W. Teitsworth. “Experimental metrics for detection of detailed balance violation.” Physical Review. E 99, no. 2–1 (February 2019): 022143. https://doi.org/10.1103/physreve.99.022143.Full Text
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Ghanta, Akhil, John C. Neu, and Stephen Teitsworth. “Fluctuation loops in noise-driven linear dynamical systems.” Physical Review. E 95, no. 3–1 (March 2017): 032128. https://doi.org/10.1103/physreve.95.032128.Full Text
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Dannenberg, Paul H., John C. Neu, and Stephen W. Teitsworth. “Steering most probable escape paths by varying relative noise intensities.” Physical Review Letters 113, no. 2 (July 2014): 020601. https://doi.org/10.1103/physrevlett.113.020601.Full Text
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Bomze, Yu, R. Hey, H. T. Grahn, and S. W. Teitsworth. “Noise-induced current switching in semiconductor superlattices: observation of nonexponential kinetics in a high-dimensional system.” Physical Review Letters 109, no. 2 (July 2012): 026801. https://doi.org/10.1103/physrevlett.109.026801.Full Text
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Bomze, Yu, R. Hey, H. T. Grahn, and S. W. Teitsworth. “Noise-Induced Current Switching in Semiconductor Superlattices: Observation of Nonexponential Kinetics in a High-Dimensional System.” Physical Review Letters 109, no. 026801 (2012): 4.
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Heinrich, M., T. Dahms, V. Flunkert, S. W. Teitsworth, and E. Schöll. “Symmetry-breaking transitions in networks of nonlinear circuit elements.” New Journal of Physics 12 (November 1, 2010). https://doi.org/10.1088/1367-2630/12/11/113030.Full Text
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Bonilla, L. L., and S. W. Teitsworth. “Nonlinear Wave Methods for Charge Transport.” Nonlinear Wave Methods for Charge Transport, September 20, 2010. https://doi.org/10.1002/9783527628674.Full Text
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Xu, H., and S. W. Teitsworth. “Emergence of current branches in a series array of negative differential resistance circuit elements.” Journal of Applied Physics 108, no. 4 (August 15, 2010). https://doi.org/10.1063/1.3475988.Full Text Open Access Copy
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Xu, H., and S. W. Teitsworth. “On the possibility of a shunt-stabilized superlattice terahertz emitter.” Applied Physics Letters 96, no. 2 (January 25, 2010). https://doi.org/10.1063/1.3291614.Full Text Open Access Copy
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Bonilla, L. L., and S. W. Teitsworth. “Nonlinear Wave Methods for Charge Transport.” Nonlinear Wave Methods for Charge Transport, 2010.
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Xu, H., and S. W. Teitsworth. “On the possibility of a shunt-stabilized superlattice THz emitter.” Applied Physics Letters 96, no. 022101 (2010): 3pages.
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Xu, H., A. Amann, E. Schöll, and S. W. Teitsworth. “Dynamics of electronic transport in a semiconductor superlattice with a shunting side layer.” Physical Review B Condensed Matter and Materials Physics 79, no. 24 (June 19, 2009). https://doi.org/10.1103/PhysRevB.79.245318.Full Text
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Xu, H., A. Amann, E. Schoell, and S. W. Teitsworth. “Dynamics of electronic transport in a semiconductor superlattice with a shunting side layer.” Physical Review B 79, no. 245318 (2009): 14.
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Xu, H., and S. W. Teitsworth. “Dependence of electric field domain relocation dynamics on contact conductivity in semiconductor superlattices.” Physical Review B Condensed Matter and Materials Physics 76, no. 23 (December 3, 2007). https://doi.org/10.1103/PhysRevB.76.235302.Full Text
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Xu, Huidong, and Stephen W. Teitsworth. “Dependence of electric field domain relocation dynamics on contact conductivity in semiconductor superlattices.” Physical Review B 76, no. 235302 (2007): 11pages.
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Lu, S. L., L. Schrottke, S. W. Teitsworth, R. Hey, and H. T. Grahn. “Negative differential conductance and bistability in undoped GaAs/(Al,Ga)As quantum-cascade structures.” Journal of Applied Physics 100, no. 2 (August 11, 2006). https://doi.org/10.1063/1.2214362.Full Text
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Lu, S. L., L. Schrottke, S. W. Teitsworth, R. Hey, and H. T. Grahn. “Negative differential conductance and bistability in undoped GaAs/AlGaAs quantum-cascade structures.” Journal of Applied Physics 100, no. 023701 (July 2006): 6pages.
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Lu, S. L., L. Schrottke, S. W. Teitsworth, R. Hey, and H. T. Grahn. “Formation of electric-field domains in GaAs Alx Ga1-x As quantum cascade laser structures.” Physical Review B Condensed Matter and Materials Physics 73, no. 3 (February 27, 2006). https://doi.org/10.1103/PhysRevB.73.033311.Full Text
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Lu, S. L., L. Schrottke, S. W. Teitsworth, R. Hey, and H. T. Grahn. “Formation of electric-field domains in GaAs/AlGaAs quantum cascade laser structures.” Physical Review B 73, no. 033311 (January 2006): 4pages.
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Rogozia, M., H. T. Grahn, S. W. Teitsworth, and K. H. Ploog. “Time distribution of the domain-boundary relocation in superlattices.” Physica B: Condensed Matter 314, no. 1–4 (March 1, 2002): 427–30. https://doi.org/10.1016/S0921-4526(01)01387-4.Full Text
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Rogozia, M., S. W. Teitsworth, H. T. Grahn, and K. H. Ploog. “Relocation dynamics of domain boundaries in semiconductor superlattices.” Physical Review B 65, no. 205303 (2002): 1–7.
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Rogozia, M., S. W. Teitsworth, H. T. Grahn, and K. H. Ploog. “Relocation dynamics of domain boundaries in semiconductor superlattices.” Physical Review B Condensed Matter and Materials Physics 65, no. 20 (January 1, 2002): 1–7. https://doi.org/10.1103/PhysRevB.65.205303.Full Text
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Cantalapiedra, I. R., M. J. Bergmann, L. L. Bonilla, and S. W. Teitsworth. “Chaotic motion of space charge wave fronts in semiconductors under time-independent voltage bias.” Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics 63, no. 5 Pt 2 (May 2001): 056216. https://doi.org/10.1103/physreve.63.056216.Full Text
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Rogozia, M., S. W. Teitsworth, H. T. Grahn, and K. Ploog. “Statistics of the domain boundary relocation time in semiconductor superlattices.” Physical Review B Rapid Communications 64, no. 041308 (2001): 1–4.
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Teitsworth, S. W., M. Rogozia, H. T. Grahn, and K. H. Ploog. “Statistics of the domain-boundary relocation time in semiconductor superlattices.” Physical Review B Condensed Matter and Materials Physics 64, no. 4 (January 1, 2001). https://doi.org/10.1103/PhysRevB.64.041308.Full Text
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Cantalapiedra, I. R., M. J. Bergmann, L. L. Bonilla, and S. W. Teitsworth. “Chaotic motion of space charge wave fronts in semiconductors under time-independent voltage bias.” Physical Review E Statistical, Nonlinear, and Soft Matter Physics 63, no. 5 II (2001): 562161–67.
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Olafsen, L. J., T. Daniels-Race, R. E. Kendall, and S. W. Teitsworth. “Photoluminescence of n-i-n GaAs/AlAs single quantum well structures under electric field bias.” Superlattices and Microstructures 27, no. 1 (January 1, 2000): 7–14. https://doi.org/10.1006/spmi.1999.0811.Full Text
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Olafsen, L. J., T. Daniels-Race, R. E. Kendall, and S. W. Teitsworth. “Photoluminescence of n-i-n GaAs/AlAs single quantum well structures under electric field bias.” Superlattices and Microstructures 27, no. 1 (January 2000): 39–51. https://doi.org/10.1006/spmi.1999.0818.Full Text
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Luo, K. J., S. W. Teitsworth, H. Kostial, H. T. Grahn, and N. Ohtani. “Controllable bistabilities and bifurcations in a photoexcited GaAs/AlAs superlattice.” Applied Physics Letters 74, no. 25 (June 21, 1999): 3845–47. https://doi.org/10.1063/1.124199.Full Text
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Luo, K., H. Grahn, S. Teitsworth, and K. Ploog. “Influence of higher harmonics on Poincaré maps derived from current self-oscillations in a semiconductor superlattice.” Physical Review B Condensed Matter and Materials Physics 58, no. 19 (January 1, 1998): 12613–16. https://doi.org/10.1103/PhysRevB.58.12613.Full Text
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Blue, L. J., T. Daniels-Race, R. E. Kendall, C. R. Schmid, and S. W. Teitsworth. “Dependence of current-voltage characteristics on Al mole fraction in GaAs/AlxGa1-xAs asymmetric double barrier structures.” Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures 15, no. 3 (May 1, 1997): 696–701.
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Banoo, K. “Phonon scattering in novel superlattice-asymmetric double barrier resonant tunneling structure.” Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures 14, no. 4 (1996): 2725–30.
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Bergmann, M. J., S. W. Teitsworth, L. L. Bonilla, and I. R. Cantalapiedra. “Solitary-wave conduction in p-type Ge under time-dependent voltage bias.” Physical Review. B, Condensed Matter 53, no. 3 (January 1996): 1327–35. https://doi.org/10.1103/physrevb.53.1327.Full Text
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Turley, P. J., C. R. Wallis, and S. W. Teitsworth. “Selection rule for localized phonon emission in GaAs/AlAs double-barrier structures.” Journal of Applied Physics 78, no. 10 (December 1, 1995): 6104–7. https://doi.org/10.1063/1.360551.Full Text
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Cruz RM, P. G. de la, S. W. Teitsworth, and M. A. Stroscio. “Interface phonons in spherical GaAs/AlxGa1-xAs quantum dots.” Physical Review. B, Condensed Matter 52, no. 3 (July 1995): 1489–92. https://doi.org/10.1103/physrevb.52.1489.Full Text
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Bonilla, L. L., I. R. Cantalapiedra, M. J. Bergmann, and S. W. Teitsworth. “Onset of current oscillations in extrinsic semiconductors under DC voltage bias.” Semiconductor Science and Technology 9, no. 5 S (December 1, 1994): 599–602. https://doi.org/10.1088/0268-1242/9/5S/054.Full Text
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Teitsworth, S. W., P. J. Turley, C. R. Wallis, W. Li, and P. K. Bhattacharya. “Magnetotunnelling measurements of localized optical phonons in GaAs/AlAs double-barrier structures.” Semiconductor Science and Technology 9, no. 5 S (December 1, 1994): 508–11. https://doi.org/10.1088/0268-1242/9/5S/029.Full Text
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Wallis, C. R., and S. W. Teitsworth. “Hopf bifurcations and hysteresis in resonant tunneling diode circuits.” Journal of Applied Physics 76, no. 7 (December 1, 1994): 4443–45. https://doi.org/10.1063/1.357343.Full Text
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Turley, P. J., and S. W. Teitsworth. “Phonon-assisted tunneling from a two-dimensional emitter state.” Physical Review. B, Condensed Matter 50, no. 12 (September 1994): 8423–32. https://doi.org/10.1103/physrevb.50.8423.Full Text
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Cantalapiedra, I. R., L. L. Bonilla, M. J. Bergmann, and S. W. Teitsworth. “Solitary-wave dynamics in extrinsic semiconductors under dc voltage bias.” Physical Review. B, Condensed Matter 48, no. 16 (October 1993): 12278–81. https://doi.org/10.1103/physrevb.48.12278.Full Text
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Turley, P. J., C. R. Wallis, S. W. Teitsworth, W. Li, and P. K. Bhattacharya. “Tunneling measurements of symmetrical-interface phonons in gaas/alas double-barrier structures.” Physical Review B 47, no. 19 (May 1993): 12640–48.
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Dela Cruz, R. M., S. W. Teitsworth, and M. A. Stroscio. “Bottleneck effects due to confined phonons in quantum dots.” Superlattices and Microstructures 13, no. 4 (January 1, 1993): 481–86. https://doi.org/10.1006/spmi.1993.1090.Full Text
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Kim, K. W., A. R. Bhatt, M. A. Stroscio, P. J. Turley, and S. W. Teitsworth. “Effects of interface phonon scattering in multiheterointerface structures.” Journal of Applied Physics 72, no. 6 (December 1, 1992): 2282–87. https://doi.org/10.1063/1.351569.Full Text
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Turley, P. J., and S. W. Teitsworth. “Theory of localized phonon modes and their effects on electron tunneling in double-barrier structures.” Journal of Applied Physics 72, no. 6 (December 1, 1992): 2356–66. https://doi.org/10.1063/1.351577.Full Text
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Turley, P. J., and S. W. Teitsworth. “Effects of localized phonon modes on magnetotunneling spectra in double-barrier structures.” Physical Review. B, Condensed Matter 44, no. 23 (December 1991): 12959–63. https://doi.org/10.1103/physrevb.44.12959.Full Text
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Turley, P. J., and S. W. Teitsworth. “Phonon-assisted tunneling due to localized modes in double-barrier structures.” Physical Review. B, Condensed Matter 44, no. 15 (October 1991): 8181–84. https://doi.org/10.1103/physrevb.44.8181.Full Text
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Turley, P. J., and S. W. Teitsworth. “Electronic wave functions and electron-confined-phonon matrix elements in GaAs/AlxGa1-xAs double-barrier resonant-tunneling structures.” Physical Review. B, Condensed Matter 44, no. 7 (August 1991): 3199–3210. https://doi.org/10.1103/physrevb.44.3199.Full Text
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Bonilla, L. L., and S. W. Teitsworth. “Theory of periodic and solitary space charge waves in extrinsic semiconductors.” Physica D: Nonlinear Phenomena 50, no. 3 (January 1, 1991): 545–59. https://doi.org/10.1016/0167-2789(91)90014-Z.Full Text
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Teitsworth, S. W. “The physics of space charge instabilities and temporal chaos in extrinsic photoconductors.” Applied Physics a Solids and Surfaces 48, no. 2 (February 1, 1989): 127–36. https://doi.org/10.1007/BF01141274.Full Text
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Westervelt, R. M., E. G. Gwinn, and S. W. Teitsworth. “Chaotic dynamics in Ge photoconductors.” Nuclear Physics B (Proceedings Supplements) 2, no. C (January 1, 1987): 37–48. https://doi.org/10.1016/0920-5632(87)90007-7.Full Text
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Teitsworth, S. W., and R. M. Westervelt. “Subharmonic and chaotic response of periodically driven extrinsic Ge photoconductors.” Physical Review Letters 56, no. 5 (February 1986): 516–19. https://doi.org/10.1103/physrevlett.56.516.Full Text
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Teitsworth, S. W., B. A. Lynn, and R. M. Westervelt. “Chaotic dynamics in a simple model of extrinsic photoconductors.” Physica Scripta 1986, no. T14 (January 1, 1986): 71–75. https://doi.org/10.1088/0031-8949/1986/T14/012.Full Text
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Teitsworth, S. W., and R. M. Westervelt. “Nonlinear current-voltage characteristics and spontaneous current oscillations in p-Ge.” Physica D: Nonlinear Phenomena 23, no. 1–3 (January 1, 1986): 181–86. https://doi.org/10.1016/0167-2789(86)90126-0.Full Text
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Westervelt, R. M., S. W. Teitsworth, and E. G. Gwinn. “Chaotic dynamics in ge photoconductors.” Physica Scripta 1986, no. T14 (January 1, 1986): 65–70. https://doi.org/10.1088/0031-8949/1986/T14/011.Full Text
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Westervelt, R. M., and S. W. Teitsworth. “Nonlinear dynamics and chaos in extrinsic photoconductors.” Physica D: Nonlinear Phenomena 23, no. 1–3 (January 1, 1986): 187–94. https://doi.org/10.1016/0167-2789(86)90127-2.Full Text
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Westervelt, R. M., and S. W. Teitsworth. “Nonlinear transient response of extrinsic Ge far-infrared photoconductors.” Journal of Applied Physics 57, no. 12 (December 1, 1985): 5457–69. https://doi.org/10.1063/1.334822.Full Text
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Teitsworth, S. W., and R. M. Westervelt. “Chaos and broadband noise in extrinsic photoconductors.” Physical Review Letters 53, no. 27 (January 1, 1984): 2587–90. https://doi.org/10.1103/PhysRevLett.53.2587.Full Text
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Teitsworth, S. W., R. M. Westervelt, and E. E. Haller. “Nonlinear oscillations and chaos in electrical breakdown in Ge.” Physical Review Letters 51, no. 9 (January 1, 1983): 825–28. https://doi.org/10.1103/PhysRevLett.51.825.Full Text
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Conference Papers
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Neu, J. C., A. Ghanta, and S. W. Teitsworth. “The Geometry of most probable trajectories in noise-driven dynamical systems.” In Springer Proceedings in Mathematics and Statistics, 232:153–67, 2018. https://doi.org/10.1007/978-3-319-76599-0_9.Full Text
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- Teaching & Mentoring
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Recent Courses
- PHYSICS 137S: Energy in the 21st Century and Beyond 2023
- PHYSICS 491: Independent Study: Advanced Topics 2023
- PHYSICS 763: Statistical Mechanics 2023
- PHYSICS 791: Special Readings 2023
- PHYSICS 190S: Special Topics in Physics 2022
- PHYSICS 493: Research Independent Study 2022
- PHYSICS 763: Statistical Mechanics 2022
- PHYSICS 137S: Energy in the 21st Century and Beyond 2021
- PHYSICS 714: Quantum Mechanics 1 2021
- PHYSICS 763: Statistical Mechanics 2021
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Advising & Mentoring
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Spring 2019:
Undergraduate Research Mentoring:
Devon Shusterman, “Noise-driven models for describing nonlinear electronic transport in memristors.”
Chongbin Zhong, "Analysis of stock market price fluctuations using stochastic area."
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Spring 2019:
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Teaching Activities
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SPRING 2022:
PHY 190S, Special Topics in Physics - the Physics of Energy
PHY 493, Research Independent Study - Noisy Nonlinear Dynamics
FALL 2022:
PHY 763, Statistical Mechanics
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SPRING 2022:
- Scholarly, Clinical, & Service Activities
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Presentations & Appearances
- Characterizing irreversibility in noise-driven dynamical systems with stream functions. APS March Meeting. American Physical Society. March 14, 2022 - March 18, 2022 2022
- Stochastic Dynamics of Far-from-Equilibrium Electronic Transport Systems. SIAM Conference on Applications of Dynamical Systems (DS21). Society for Industrial and Applied Mathematics. May 23, 2021 - May 27, 2021 2021
- Metrics of irreversibility in noise-driven dynamical systems. Complexity Seminar Series. Potsdam Institute for Climate Impact Research. November 5, 2019 - November 7, 2019 2019
- Noise-induced dynamics in electronic transport systems. Quantum Cascade Laser Group Seminar. Paul-Drude-Institute for Solid State Electronics. November 1, 2019 2019
- The surprising role of noise in complex systems: from nanoscale electronic transport to global climate dynamics. Physics Colloquium Series. Appalachian State University. March 29, 2019 2019
- Noise-induced dynamics in far-from-equilibrium electronic transport systems. March General Meeting. American Physical Society. March 6, 2019 2019
- Noise-induced switching dynamics of bistable electronic transport systems. June 25, 2013 2013
- Noise-induced switching dynamics in semiconductor nanostructures. June 18, 2013 2013
- Measurement of stochastic switching in nonlinear electronic transport systems. June 14, 2011 2011
- Electric field domains in semiconductor superlattices. December 7, 2009 2009
- Electric field domains in semiconductor superlattices. November 10, 2009 2009
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Outreach & Engaged Scholarship
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Service to the Profession
- Reviewer and Panlest. NSF Graduate Research Fellowship Program . National Science Foundation. December 2022 - January 2023 2022 - 2023
- Organizer for two focus sessions on Noise-driven dynamics in far-from-equilibrium systems. APS March 2022 Meeting. American Physical Society. March 14, 2022 - March 18, 2022 2022
- Co-organizer for minisymposium at international meeting - Novel Noise-Driven Dynamics in Far-From-Equilibrium Systems. SIAM Conference on Applications of Dynamical Systems (DS21). Society for Industrial and Applied Math. May 23, 2021 - May 27, 2021 2021
- Referee for several scholarly journals. January 2020 - December 2022 2020 - 2022
- Co-organizer for minisymposium at international meeting. Minisymposium on Novel Noise-Driven Dynamics in Far-from-Equilibrium Systems. SIAM (Society for Industrial and Applied Math) Dynamical Systems Meeting 2019. May 19, 2019 - May 23, 2019 2019
- Organizer and Chair, Focus Session “Noise-driven dynamics in far-from-equilibrium systems.”. APS 2019 March Meeting. American Physical Society. March 4, 2019 - March 8, 2019 2019
- NSF SBIR panel on Electronic Materials - Phase II. October 20, 2009 2009
- NSF SBIR panel on Electronic Materials - Phase I. August 6, 2009 2009
- NSF SBIR Phase I panel - Nanoparticles and Nanocomposites. September 11, 2008 2008
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Service to Duke
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