On the possibility of a shunt-stabilized superlattice terahertz emitter
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2010-01-25
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High field electronic transport through a strongly coupled superlattice (SL) with a shunting side layer is numerically studied using a drift-diffusion model that includes both vertical and lateral dynamics. The bias voltage corresponds to an average electric field in the negative differential conductivity region of the intrinsic current-field curve of the SL, a condition that generally implies space charge instability. Key structural parameters associated with both the shunt layer and SL are identified for which the shunt layer stabilizes a uniform electric field profile. These results support the possibility to realize a SL-based terahertz oscillator with a carefully designed structure. © 2010 American Institute of Physics.
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Xu, H, and SW Teitsworth (2010). On the possibility of a shunt-stabilized superlattice terahertz emitter. Applied Physics Letters, 96(2). p. 22101. 10.1063/1.3291614 Retrieved from https://hdl.handle.net/10161/3244.
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Stephen W. Teitsworth
Prof. Stephen Teitsworth's research centers on theoretical and experimental studies of noise-driven processes in far-from-equilibrium systems. Recent activity has centered around the development and implementation of novel metrics such as stochastic area which allow one to quantify how far from equilibrium a system is. These concepts have been developed and applied to low dimensional systems such as mechanical mass-spring assemblies and coupled electronic circuits driven by out-of-equilibrium noise sources.
Two problems of current interest are: 1) the extension of the stochastic area and related concepts to high-dimensional spatially continuous systems such as elastic filaments (e.g., strings or rods) embedded in viscoelastic media and driven by active noise sources; 2) studies of first-passage processes associated with heating of trapped ions in Paul traps (in collaboration with the group of Prof. Noel at Duke).
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