Impurity compensation and band-gap renormalization in
double-quantum-wires |
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Authors: | Email author" target="_blank">T?VazifehshenasEmail author F?Ebrahimi |
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Institution: | (1) Department of Nano and Microelectronics Engineering, Shahid Beheshti University, Evin, 1983963113, Tehran, Iran |
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Abstract: | We investigate the band-gap renormalization due to electron-electron interaction in the n-type doped GaAs-based
double-quantum-wire systems. Electron self-energy is calculated using the leading-order perturbation theory
(GW) within the full random-phase-approximation (RPA). We include the impurity effects through Mermin
expression and show that decreasing the spacing in double-wire system can compensate partly the undesirable
effect of impurities on the band-gap renormalization. Therefore, it is possible to offset the effect of
impurity in related devices and to adjust the band-gap. We also, apply a constant electric field to one of the
wires. It is shown that the change of the band-gap renormalization in the other wire will be insignificant if
the drift velocity does not exceed Fermi velocity. |
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Keywords: | |
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