Longitudinal Magnetophonon Resonances in Semiconductor Superlattices

半导体超晶格中的纵向磁声子共振

• 批准号: 13650344
• 负责人: MORI Nobuya
• 金额: $ 2.37万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650344/
• 关键词: superlattice; magnetophonon resonance; electron-phonon interaction; miniband transport; Wannier-Stark localization; nonequilibrium Green's function; Monte Carlo method; magnetotransport; 低次元電子系; 化合物半導体

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).

量子化磁场的存在强烈地改变了半导体超晶格的电子性质。当施加一个强磁场垂直于异质界面和平行于电场（纵向配置），运输成为准一维（Q1 D）。如果朗道能级微带（LLMB）被很好地分辨，纵光学（LO）声子的共振散射引起磁声子共振（MPR）。利用系综Monte Carlo方法模拟了高温下Landau量子化GaAs/AlAs超晶格中电子的运动，考虑了不同的光学声子模，研究了光学声子多模行为的影响.我们发现，在道尔顿等人预测的周期性声子发射和吸收条件下，漂移速度会发生强烈的增强。利用Wacker等人发展的非平衡绿色函数技术[A. Wacker，物理代表，357，1（2002）]。量子结果进行了比较，从Monte Carlo模拟玻尔兹曼的输运方程得到的相应结果。我们的计算集中在Wannier-Stark（WS）本地化增加的区域中的速度-电场曲线的形式。我们发现，电流流动强烈调制的斯塔克回旋共振（SCR）和光学声子共振（OPR）的微妙的相互作用。

项目成果

N Mori, C Hamaguchi, A Patane, L Eaves, PC Main: "Magneto-tunneling spectroscopy of quantum structures"Microelectronic Engineering. 63. 109-114 (2002)

N Mori、C Hamaguchi、A Patane、L Eaves、PC 主要：“量子结构的磁隧道光谱”微电子工程。

N.Mori, C.Hamaguchi, L.Eaves, P.C.Main: "Numerical studies of miniband conduction in quasi-one-dimensional superlattices"VLSI Design. 13. 45-50 (2001)

N.Mori、C.Hamaguchi、L.Eaves、P.C.Main：“准一维超晶格中微带传导的数值研究”VLSI 设计。

N Mori, C Hamaguchi, L Eaves, PC Main: "Phonon cycling in GaAs/AlAs superlattices"Proceedings of the 26th International Conference on the Physics of Semiconductors. (印刷中).

N Mori、C Hamaguchi、L Eaves、PC Main：“GaAs/AlAs 超晶格中的声子循环”第 26 届国际半导体物理会议论文集（正在出版）。

N Mori, C Hamaguchi, A Patane, L Eaves, and PC Main: "Magneto-tunneling spectroscopy of quan-turn structures"Microelectronic Engineering. 63. 109-114 (2002)

N Mori、C Hamaguchi、A Patane、L Eaves 和 PC Main：“全转结构的磁隧道光谱”微电子工程。

N Mori, C Hamaguchi, L.Eaves, P.C. Main: "Phonon cycling in GaAs/AlAs superlattices"Proceedings of the 26th International Conference on the Physics of Semiconductors. (印刷中).

N Mori、C Hamaguchi、L.Eaves、P.C. Main：“GaAs/AlAs 超晶格中的声子循环”第 26 届国际半导体物理学会议论文集（正在出版）。