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Title: Enhancement of electron mobility in asymmetric coupled quantum well structures

We study the low temperature multisubband electron mobility in a structurally asymmetric GaAs/Al{sub x}Ga{sub 1-x}As delta doped double quantum well. We calculate the subband energy levels and wave functions through selfconsistent solution of the coupled Schrodinger equation and Poisson's equation. We consider ionized impurity scattering, interface roughness scattering, and alloy disorder scattering to calculate the electron mobility. The screening of the scattering potentials is obtained by using static dielectric response function formalism within the random phase approximation. We analyze, for the first time, the effect of asymmetric structure parameters on the enhancement of multisubband electron mobility through intersubband interactions. We show that the asymmetric variation of well width, doping concentration, and spacer width considerably influences the interplay of scattering mechanisms on mobility. Our results of asymmetry induced enhancement of electron mobility can be utilized for low temperature device applications.
Authors:
; ; ;  [1]
  1. Department of Electronics and Communication Engineering, National Institute of Science and Technology, Palur Hills, Berhampur 761 008, Odisha (India)
Publication Date:
OSTI Identifier:
22278043
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 7; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ALUMINIUM ARSENIDES; ASYMMETRY; CONCENTRATION RATIO; DIELECTRIC MATERIALS; DOPED MATERIALS; ELECTRON MOBILITY; ENERGY LEVELS; GALLIUM ARSENIDES; INTERFACES; POISSON EQUATION; POTENTIALS; QUANTUM WELLS; RANDOM PHASE APPROXIMATION; RESPONSE FUNCTIONS; ROUGHNESS; SCATTERING; SCHROEDINGER EQUATION