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Chin. Phys. B, 2009, Vol. 18(12): 5431-5436    DOI: 10.1088/1674-1056/18/12/050
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Orbital magnetization in semiconductors

Fang Cheng(方诚)a)b)c), Wang Zhi-Gang(王志刚)c), Li Shu-Shen(李树深)a), and Zhang Ping(张平)c)d)
a Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China; b Physics Department, East China Institute of Technology, Fuzhou 344000, Jiangxi Province, China; c Institute of Applied Physics and Computational Mathematics, Beijing 100088, China; d Center for Applied Physics and Technology, Peking University, Beijing 100871, China
Abstract  This paper theoretically investigates the orbital magnetization of electron-doped (n-type) semiconductor heterostructures and of hole-doped (p-type) bulk semiconductors, which are respectively described by a two-dimensional electron/hole Hamiltonian with both the included Rashba spin--orbit coupling and Zeeman splitting terms. It is the Zeeman splitting, rather than the Rashba spin--orbit coupling, that destroys the time-reversal symmetry of the semiconductor systems and results in nontrivial orbital magnetization. The results show that the magnitude of the orbital magnetization per hole and the Hall conductance in the p-type bulk semiconductors are about 10-2--10-1 effective Bohr magneton and 10-1--1 e2/h, respectively. However, the orbital magnetization per electron and the Hall conductance in the n-type semiconductor heterostructures are too small to be easily observed in experiment.
Keywords:  orbital magnetization      Zeeman splitting      Berry phase effect      semiconductor  
Received:  12 March 2009      Revised:  07 April 2009      Accepted manuscript online: 
PACS:  75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects)  
  71.70.Ej (Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)  
  72.20.My (Galvanomagnetic and other magnetotransport effects)  
  73.40.Kp (III-V semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions)  
  75.50.Pp (Magnetic semiconductors)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos 60821061, 60776061, 10604010 and 60776063).

Cite this article: 

Fang Cheng(方诚), Wang Zhi-Gang(王志刚), Li Shu-Shen(李树深), and Zhang Ping(张平) Orbital magnetization in semiconductors 2009 Chin. Phys. B 18 5431

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