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Electron-spin polarization and its relaxation probed by femtosecond laser absorption

Lai Tian-Shu Liu Lu-Ning Lei Liang Shou Qian Li Xi-Ying Wang Jia-Hui Lin Wei-Zhu

Electron-spin polarization and its relaxation probed by femtosecond laser absorption

Lai Tian-Shu, Liu Lu-Ning, Lei Liang, Shou Qian, Li Xi-Ying, Wang Jia-Hui, Lin Wei-Zhu
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  • Received Date:  27 April 2004
  • Accepted Date:  25 June 2004
  • Published Online:  01 March 2005

Electron-spin polarization and its relaxation probed by femtosecond laser absorption

  • 1. 中山大学光电材料与技术国家重点实验室,物理系,广州 510275

Abstract: Based on the rate equations of a two_level system, the analytical solutions of r elaxation of carrier populations with spin_up and spin_down polarization are obt ained under the condition of incomplete initial spin polarization. In the small signal regime, the saturated absorption_change expression of right_ and left_cir cularly polarized probe beam is given. The parameter, initial degree of spin pol arization of electron population, appears in the expression. Therefore, the init ial degree of spin polarization of electron population, which is a very importan t key parameter in the transport of spin polarization, can be extracted by fitti ng the expression to the saturated absorption trace obtained experimentally. Fin ally, the initial degree of spin polarization of photo_injected electron populat ion and its relaxation time constant in GaAs/AlGaAs multiple quantum wells are a cquired in experiments.

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