Resonant spin amplification in n-type GaAs
Resonant spin amplification in n-type GaAs
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DOI:
10.1103/physrevlett.80.4313
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发表时间:
1998-05-11
影响因子:
8.6
通讯作者:
Awschalom, DD
中科院分区:
文献类型:
--
作者:
Kikkawa, JM;Awschalom, DD
Extended electron spin precession in n-type GaAs bulk semiconductors is directly observed by femtosecond time-resolved Faraday rotation in the Voigt geometry. Synchronous optical pumping of the spin system amplifies and sustains spin motion, exposing a regime where spin lifetimes increase tenfold at low fields and exceed 100 ns at zero field. Precise studies in field and temperature provide clues to the relevant electron relaxation mechanisms, indicating a strong dependence on doping concentration.