The tunable antenna-coupled intersubband terahertz (TACIT) sensor is a heterodyne mixer based on the coupling of intersubband absorption with the sheet resistivity of doped GaAs/AlGaAs quantum wells. A theoretical treatment of this device as an open quantum system operating at the ballistic limit leads to the development of perfectly matched layers for the position-space Liouville-von Neumann equation.
Meanwhile, the nonlinear dynamics of weakly-coupled, doped GaAs/AlGaAs superlattices in the sequential-tunneling regime are theoretically characterized by computing the Poincar\'e map of a self-consistent, semiclassical resonant tunneling model. Applied to shorter superlattices at higher bias voltages, period-doubling cascades to high-frequency chaos are observed, and their robustness to variations in the design parameters is explored.
|Advisor:||Sherwin, Mark, Birnir, Björn|
|Commitee:||Nayak, Chetan, Srednicki, Mark|
|School:||University of California, Santa Barbara|
|School Location:||United States -- California|
|Source:||DAI-B 79/02(E), Dissertation Abstracts International|
|Subjects:||Quantum physics, Physics, Nanotechnology|
|Keywords:||Tunable antenna-coupled intersubband terahertz|
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