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Title: Calculations of the acoustoelectric current in a quantum well by using a quantum kinetic equation
Authors: Bau, Nguyenquang
Hieu, Nguyenvan
Nhan, Nguyenvu
Keywords: Electron-external acoustic wave interaction;Electron-internal phonons scattering;Quantum acoustoelectric current;Quantum kinetic equation;Quantum well
Issue Date: 2012
Publisher: H. : ĐHQGHN
Abstract: An analytic expression for the acoustoelectric current (AC) jac induced by electron-external acoustic wave interactions and electron-internal acoustic wave (internal phonons) scattering in a quantum well (QW) is calculated by using the quantum kinetic equation for electrons. The physical problem is investigated in the region ql ≫ 1 (where q is the acoustic wave number and l is the electrons mean free path). The dependence of the AC jac on the external acoustic wave frequency ωq̄, the width of the QW L and the temperature T for a specific QW of AlGaAs/GaAs/AlGaAs is achieved by using a numerical method. The computational results show that the dependence of the AC jac on the temperature T, the external acoustic wave frequency ωq̄, the width of the QW L is non-monotonic and that the peaks can be attributed to transitions between mini-bands n → n′. The dependence of the AC jac on the temperature T and the Fermi energy ∈F is obtained, and a maximum of the AC jac for ∈F = 0. 038 eV and ωq̄ = 3 ×1011s-1 seen at T = 50 K, which agrees with the experimental results for AlGaAs/GaAs/AlGaAs QWs. All these results are compared with those for normal bulk semiconductors and superlattices to show the differences. Finally, the quantum theory of the acoustoelectric effect in a quantum well is newly developed.
Description: Journal of the Korean Physical Society Volume 61, Issue 12, December 2012, Pages 2026-2031
Appears in Collections:Bài báo của ĐHQGHN trong Scopus

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