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Title:Pseudospin transfer torques and the effect of disorder in semiconductor electron bilayers
Author(s):Kim, Youngseok
Advisor(s):Gilbert, Matthew J.
Department / Program:Electrical & Computer Eng
Discipline:Electrical & Computer Engr
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Pseudospin ferromagnetism
semiconductor bilayer
Abstract:We use self-consistent quantum transport theory to investigate the influence of electron-electron interactions on interlayer transport in semiconductor electron bilayers in the absence of an external magnetic fi eld. We conclude that, even though spontaneous pseudospin order does not occur at zero field, interaction-enhanced quasiparticle tunneling amplitudes and pseudospin transfer torques do alter tunneling I-V characteristics, and can lead to time-dependent response to a dc bias voltage. In addition, we study the eff ects of disorder on the interlayer transport properties of disordered semiconductor bilayers. We find that the addition of material disorder to the system affects interlayer interactions leading to signifi cant deviations in the interlayer transfer characteristics. In particular, we find that disorder decreases and broadens the tunneling peak, eff ectively reducing the interacting system to a non-interacting system. Our results suggest that the experimental observation of interaction-enhanced interlayer transport in semiconductor bilayers requires materials with mean-free paths larger than the spatial extent of the system.
Issue Date:2012-05-22
Rights Information:Copyright 2012 Youngseok Kim
Date Available in IDEALS:2012-05-22
Date Deposited:2012-05

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