TITLE

Effect of Ka-band microwave on the spin dynamics of electrons in a GaAs/Al0.35Ga0.65As heterostructure

AUTHOR(S)
Haihui Luo; Xuan Qian; Xiaofang Gu; Yang Ji; Umansky, Vladimir
PUB. DATE
May 2009
SOURCE
Applied Physics Letters;5/11/2009, Vol. 94 Issue 19, p192107
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report experimental results of the effect of Ka-band microwave on the spin dynamics of electrons in a two-dimensional electron system (2DES) in a GaAs/Al0.35Ga0.65As heterostructure via time-resolved Kerr rotation measurements. While the microwave reduces the transverse spin lifetime of electrons in the bulk GaAs, it significantly increases that in the 2DES, from 745 to 1213 ps, when its frequency is close to the Zeeman splitting of the electrons in the magnetic field. Such a microwave-enhanced spin lifetime is ascribed to the microwave-induced electron scattering which leads to a “motional narrowing” of spins via D’yakonov–Perel’ mechanism.
ACCESSION #
39785829

 

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