Time-resolved and continuous-wave optical spin pumping of semiconductor quantum wells

Details Time-resolved and continuous-wave optical spin pumping of semiconductor quantum wells Time-resolved and continuous-wave optical spin pumping of semiconductor quantum wells

2008-07-23

arxiv.org/abs/0807.3640v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

26 pages, 19 figures, submitted to special issue on Optical Orientation of Semiconductor Science and Technology

Scientific paper

10.1088/0268-1242/23/11/114001

Experimental and theoretical studies of all-optical spin pump and probe of resident electrons in CdTe/(Cd,Mg)Te semiconductor quantum wells are reported. A two-color Hanle-MOKE technique (based on continuous-wave excitation) and time-resolved Kerr rotation in the regime of resonant spin amplification (based on pulsed excitation) provide a complementary measure of electron spin relaxation time. Influence of electron localization on long-lived spin coherence is examined by means of spectral and temperature dependencies. Various scenarios of spin polarization generation (via the trion and exciton states) are analyzed and difference between continuous-wave and pulsed excitations is considered. Effects related to inhomogeneous distribution of $g$-factor and anisotropic spin relaxation time on measured quantities are discussed.

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