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电声子相互作用对半导体超晶格动力学局域化的影响
引用本文:王志刚,段素青,赵宪庚.电声子相互作用对半导体超晶格动力学局域化的影响[J].中国物理 B,2005,14(6):1232-1237.
作者姓名:王志刚  段素青  赵宪庚
作者单位:Institute of Applied Physics and Computational Mathematics, P.O.Box 8009, Beijing P. R. China, 100088;Institute of Applied Physics and Computational Mathematics, P.O.Box 8009, Beijing P. R. China, 100088;Institute of Applied Physics and Computational Mathematics, P.O.Box 8009, Beijing P. R. China, 100088
摘    要:本文用单带模型分别研究了直流外场和交流外场作用下,电声子相互作用对半导体超晶格的动力学局域化性质的影响。结果表明:电声子相互作用会破坏电子的动力学局域化。对同一声子频率,电声子相互作用的强度越大,电子越快被散射;当声子频率等于直流场的布洛赫频率或交流场频率时,初始局域在某一格点的电子被迅速地散射到其他格点上去,亦即光声子共振场会严重破坏电子的动力学局域化性质。

关 键 词:电声子相互作用  动力学局域
收稿时间:8/2/2004 12:00:00 AM

Effect of electron-phonon interactions on dynamical localization of semiconductor superlattices
Wang Zhi-Gang,Duan Su-Qing and Zhao Xian-Geng.Effect of electron-phonon interactions on dynamical localization of semiconductor superlattices[J].Chinese Physics B,2005,14(6):1232-1237.
Authors:Wang Zhi-Gang  Duan Su-Qing and Zhao Xian-Geng
Institution:Institute of Applied Physics and Computational Mathematics, P.O.Box 8009, Beijing P. R. China, 100088
Abstract:Effect of the electron-phonon interactions on the property of dynamical localization of semiconductor superlattices in a single-band model under the actions of the electric dc and acfield, respectively, are investigated. The results show that the electron-phonon interactions can destroy the dynamical localization of the electron. For the same phonon frequency, when the strength of the electron-phonon interactions becomes larger, the electron is more quickly scattered. When the phonon frequency equals to the Bloch frequency ΩB in dc field or Ωin ac field or one of them in dc-ac field, the electron initially localized at the 0th site can be rapidly scattered to the other sites, where Ω is the frequency of the ac field. The property of the dynamical localization of the electron is seriously destroyed by the photon-phonon resonant field.
Keywords:electron-phonon interactions  dynamical localization
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