中国激光, 2008, 35 (s2): 86, 网络出版: 2009-01-05  

在外磁场作用下Rashba系统中的磁光吸收谱

Magnetic-Optical Absorption Spectrum in a Rashba System and Quantizing Magnetic Fields
杨翠红 1,2,*徐文 2,3曾雉 2
作者单位
1 南京信息工程大学数理学院, 江苏 南京210044
2 中国科学院固体物理研究所物质计算科学研究室, 安徽 合肥 230031
3 澳大利亚国立大学理论物理系, 澳大利亚 堪培拉0200
摘要
基于半经典玻尔兹曼方程的方法研究了InGaAs/InAlAs 系统中电子在Rashba自旋轨道耦合相互作用(RSOI)和外磁场作用下二维电子气(2DEG)的磁光吸收谱以及选择定则。RSOI的存在使朗道能级相互混合并移动, 在高迁移率和强磁场条件下, 磁光吸收谱可以观察到来自相邻郎道能级和相同自旋间的两个主吸收峰。随着电子浓度、外磁场以及自旋轨道耦合强度的不同可以相应地调制吸收谱强度和峰位等。另外, 由于朗道能级的混合, 使磁光谱出现自旋反转的跃迁, 但由于不同自旋态的电子波函数的重叠很小, 此跃迁对磁光吸收谱的贡献很小。
Abstract
The selection rules for electron-photon interaction in a two-dimensional electron gas (2DEG) in the presence of the Rashba spin-orbit interaction (RSOI) and quantizing magnetic fields in InGaAs/InAlAs-based spintronic system have been studied based on the semiclassic Boltzmann equation. As a theoretical result, two absorption peaks and abroad band absorption spectrum can be observed for high-mobility samples at relatively high magnetic fields. Similar to the spin-degeneracy system, we find that electronic transitions between the neighboring Landau levels (LLs) within the same spin orientation are the main channels for optical absorption in a spin-split 2DEG. The two absorption peaks originated from the energy spectrum varying with the strength of RSOI and the magnetic fields. And the absorption spectrum can be tuned by the electron density and Rashba parameters. However, due the LLs shifting and mixing induced by the magnetic fields and RSOI, spin-flip transitions were accompanied by the absorption of the photons and the strength of the magnetic-optical absorption peak was relatively weak.

杨翠红, 徐文, 曾雉. 在外磁场作用下Rashba系统中的磁光吸收谱[J]. 中国激光, 2008, 35(s2): 86. Yang Cuihong, Xu Wen, Zeng Zhi. Magnetic-Optical Absorption Spectrum in a Rashba System and Quantizing Magnetic Fields[J]. Chinese Journal of Lasers, 2008, 35(s2): 86.

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