Exchange effect and magneto-plasmon mode dispersion in an anisotropic two-dimensional electronic system

doi:10.1088/1674-1056/25/11/117801

中国物理B ›› 2016, Vol. 25 ›› Issue (11): 117801-117801.doi: 10.1088/1674-1056/25/11/117801

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Exchange effect and magneto-plasmon mode dispersion in an anisotropic two-dimensional electronic system

Xiaoguang Wu(吴晓光)

1 State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China

收稿日期:2016-07-23 修回日期:2016-08-18 出版日期:2016-11-05 发布日期:2016-11-05
通讯作者: Xiaoguang Wu E-mail:xgwu@red.semi.ac.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 61076092 and 61290303).

Exchange effect and magneto-plasmon mode dispersion in an anisotropic two-dimensional electronic system

Xiaoguang Wu(吴晓光)^1,2

1 State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China

Received:2016-07-23 Revised:2016-08-18 Online:2016-11-05 Published:2016-11-05
Contact: Xiaoguang Wu E-mail:xgwu@red.semi.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 61076092 and 61290303).

摘要/Abstract

摘要： The exchange effect and the magneto-plasmon mode dispersion are studied theoretically for an anisotropic two-dimensional electronic system in the presence of a uniform perpendicular magnetic field. Employing an effective low-energy model with anisotropic effective masses, which is relevant for a monolayer of phosphorus, the exchange effect due to the electron-electron interaction is treated within the self-consistent Hartree-Fock approximation. The magneto-plasmon mode dispersion is obtained by solving a Bethe-Salpeter equation for the electron density-density correlation function within the ladder diagram approximation. It is found that the exchange effect is reduced in the anisotropic system in comparison with the isotropic one. The magneto-plasmon mode dispersion shows a clear dependence on the direction of the wave vector.

关键词: two-dimensional electron gas, anisotropy, exchange effect, magneto-plasmon mode

Abstract: The exchange effect and the magneto-plasmon mode dispersion are studied theoretically for an anisotropic two-dimensional electronic system in the presence of a uniform perpendicular magnetic field. Employing an effective low-energy model with anisotropic effective masses, which is relevant for a monolayer of phosphorus, the exchange effect due to the electron-electron interaction is treated within the self-consistent Hartree-Fock approximation. The magneto-plasmon mode dispersion is obtained by solving a Bethe-Salpeter equation for the electron density-density correlation function within the ladder diagram approximation. It is found that the exchange effect is reduced in the anisotropic system in comparison with the isotropic one. The magneto-plasmon mode dispersion shows a clear dependence on the direction of the wave vector.

Key words: two-dimensional electron gas, anisotropy, exchange effect, magneto-plasmon mode

中图分类号: (Magneto-optical effects)

78.20.Ls

73.21.-b (Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems) 73.22.Lp (Collective excitations) 81.05.Zx (New materials: theory, design, and fabrication)

吴晓光. Exchange effect and magneto-plasmon mode dispersion in an anisotropic two-dimensional electronic system[J]. 中国物理B, 2016, 25(11): 117801-117801.

Xiaoguang Wu(吴晓光). Exchange effect and magneto-plasmon mode dispersion in an anisotropic two-dimensional electronic system[J]. Chin. Phys. B, 2016, 25(11): 117801-117801.

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Exchange effect and magneto-plasmon mode dispersion in an anisotropic two-dimensional electronic system

Exchange effect and magneto-plasmon mode dispersion in an anisotropic two-dimensional electronic system

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