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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. The influence of electron localization on long-lived spin coherence is examined by means of spectral and temperature dependences. 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.
Original language | English |
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Article number | 114001 |
Journal | Semiconductor Science and Technology |
Volume | 23 |
Issue number | 11 |
DOIs | |
State | Published - 1 Dec 2008 |
ID: 36467062