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Studies on the temperature and energy dependence of g factor in GaAs by femtosecond laser absorption quantum beats

Xu Hai-Hong Jiao Zhong-Xing Liu Xiao-Dong Lei Liang Wen Jin-Hui Wang Hui Lin Wei-Zhu Lai Tian-Shu

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Studies on the temperature and energy dependence of g factor in GaAs by femtosecond laser absorption quantum beats

Xu Hai-Hong, Jiao Zhong-Xing, Liu Xiao-Dong, Lei Liang, Wen Jin-Hui, Wang Hui, Lin Wei-Zhu, Lai Tian-Shu
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  • Time-resolved elliptically polarized pump-probe spectroscopy developed by us is used to study spin relaxation dynamics of electrons in an intrinsic GaAs under an external magnetic field. Absorption quantum beats are observed and attributed to Larmor precession of electron spin around the magnetic field. The frequency of this quantum beat is used as a new method to measure electronic g factor with high accuracy. In this paper, this new method is utilized to investigate the temperature and energy dependence of electronic g factor in the intrinsic GaAs. It is found that electronic g factor increases with the temperature and energy of electrons, which is guitc different from the dependence predicted by k·p theory. An empirical formula is given to describe the temperature and energy dependence of g factor by fitting experimental data.
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Publishing process
  • Received Date:  12 August 2005
  • Accepted Date:  18 October 2005
  • Published Online:  20 May 2006

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