QUANTUM BALLISTIC TRANSPORT THROUGH A DOUBLE-BEND WAVE-GUIDE STRUCTURE - EFFECTS OF DISORDER

被引:34
作者
KAWAMURA, T
LEBURTON, JP
机构
[1] Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana
关键词
D O I
10.1103/PhysRevB.48.8857
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We investigate the quantum transport properties through a variety of double-bend electron-waveguide structures using the recursive Green's-function technique. The conductance is calculated as a function of the chemical potential using the two-probe multichannel Landauer-Buttiker formula. Detailed numerical calculations are presented to study the effects of waveguide geometry, impurity scattering, interface roughness, and finite temperature on the quantum conduction. We find that the roundness of the corners washes out the resonance structure by increasing the conductance in the valley regions. Impurity scattering and interface roughness slightly shift the peak positions and decrease their amplitudes. Thermal averaging of the conductance leads to a broadening of the resonance peaks, and a corresponding decrease of the peak amplitudes.
引用
收藏
页码:8857 / 8865
页数:9
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