Photo-Induced Spin Dynamics in Semiconductor Quantum Wells
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We experimentally investigate the dynamics of spins in GaAs quantum wells under applied electric bias by photoluminescence (PL) measurements excited with circularly polarized light. The bias-dependent circular polarization of PL (P PL) with and without magnetic field is studied. The P PL without magnetic field is found to be decayed with an enhancement of increasing the strength of the negative bias. However, P PL in a transverse magnetic field shows oscillations under an electric bias, indicating that the precession of electron spin occurs in quantum wells. The results are discussed based on the electron-hole exchange interaction in the electric field.
Nanoscale Research Letters
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Atomic, Molecular, Nuclear, Particle and Plasma Physics not elsewhere classified