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Room-temperature ultrafast spin dynamics in colloidal CdSe quantum dots

Li Xia Feng Dong-Hai Pan Xian-Qun Jia Tian-Qing Shan Lu-Fan Deng Li Sun Zhen-Rong

Room-temperature ultrafast spin dynamics in colloidal CdSe quantum dots

Li Xia, Feng Dong-Hai, Pan Xian-Qun, Jia Tian-Qing, Shan Lu-Fan, Deng Li, Sun Zhen-Rong
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  • Received Date:  16 March 2012
  • Accepted Date:  18 April 2012
  • Published Online:  05 October 2012

Room-temperature ultrafast spin dynamics in colloidal CdSe quantum dots

  • 1. State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;
  • 2. State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
Fund Project:  Project supported by the National Basic Research Program of China (Grant No. 2010CB923203), the National Natural Science Foundation of China (Grant Nos. 10904038, 11104078, 51132004), and Shanghai Municipal Science and Technology Commission, China (Grant Nos. 10PJ1403400, 11JC1403500).

Abstract: Time-resolved Faraday rotation spectroscopy is used to study the spin coherence in colloidal CdSe quantum dots at room temperature. Spin dephasing time and relevant dephasing mechanisms are analyzed in different transverse magnetic fields. The exciton spin-dephasing time is 102 ps in a zero magnetic field, which is affected by hyperfine interaction between electron and nuclear spins. In a transverse magnetic field of 250 mT, the exciton spin-dephasing time becomes 294 ps due to the fact that the presence of magnetic field makes the nuclear spin fluctuations unimportant. Further increasing the external magnetic field, the spin dephasing time becomes shorter. The magnetic field dependence of the exciton spin dynamics shows that the spin dynamics is dominated by the inhomogeneous dephasing in high magnetic fields (≥ 250 mT).

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