Longitudinal Magnetophonon Resonances in Semiconductor Superlattices

量子化磁场的存在强烈地改变了半导体超晶格的电子特性。当强磁场垂直于异质界面并平行于电场（纵向结构）时，输运变为准一维（Q1D）。当朗道能级小带（LLMB）被很好地分辨时，纵向光学声子的共振散射会引起磁声子共振（MPR）。我们对朗道量子化GaAs/AlAs超晶格中电子在高温下的运动进行了集合蒙特卡罗模拟，考虑了不同的光声子模式，以研究光声子多模式行为的影响。利用Wacker等人开发的非平衡格林函数技术研究了朗道量子化超晶格中准一维系统的电子态和输运性质[a]。瓦克、phy。众议员，357,1(2002)]。将量子结果与玻尔兹曼输运方程的蒙特卡罗模拟结果进行了比较。我们着重计算了wner - stark （WS）局域化增加区域的速度-电场曲线形式。我们发现Stark回旋共振（SCR）和光声子共振（OPR）的微妙相互作用对电流进行了强调制。

The presence of a quantizing magnetic field strongly modifies the electronic properties of semiconductor superlattices (SLs). When a strong magnetic field is applied normal to the heterointerfaces and parallel to the electric field (the longitudinal configuration), transport becomes quasi-one-dimensional (Q1D). Provided the Landau level miniband (LLMB) is well resolved, resonant scattering of longitudinal optical (LO) phonons gives rise to the magnetophonon resonance (MPR). We performed ensemble Monte Carlo simulations of the electron motion in a Landau-quantized GaAs/AlAs superlattice at high temperatures, taking account of various optical-phonon modes, to investigate effects of multi-mode behavior of optical-phonons. We find that a strong drift-velocity enhancement occurs under the cyclical phonon emission and absorption condition as predicted by Dalton et al.Electronic states and transport properties of a quasi-one-dimensional system in Landau-quantized superlattices are investigated using the nonequilibrium Green's function technique developed by Wacker and co-workers [A. Wacker, Phys. Rep., 357, 1 (2002)]. The quantum results are compared with the respective results obtained from Monte Carlo simulation of Boltzmann's transport equation. Our calculation focuses on the form of the velocity-electric-field curve in the region of increasing Wannier-Stark (WS) localization. We find that the current flow is strongly modulated by a subtle interplay of Stark cyclotron resonance (SCR) and optical phonon resonance (OPR).