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We present a microscopic interpretation of recent differential transmission measurements of electron spin coherence in GaAs quantum wells. We show that certain unexpected features in the beat signal can reveal finer characteristics of excitonic correlations.
Coherent Zeeman resonance from electron spin coherence is demonstrated in a Lambda-type three-level system, coupling electron spin states via trions. The use of a mixed-type quantum well allows the optical control of electron densities.
An elliptically polarized absorption quantum-beat spectroscopy is developed and used to observe electron-spin coherence relaxation in an intrinsic bulk GaAs in Voigt geometry. The temperature dependence of electron-spin coherence lifetime is first obtained.
A general non-Markoffian theory is developed to calculate the electron spin decoherence time in a single quantum dot. Dependence of the decoherence time on the temperature and magnetic field is clarified and compared with experiments.
Electron spin coherence in self-assembled (In,Ga)As/GaAs quantum dots has been studied by pump-probe Faraday rotation experiments. Several aspects such as creation of spin coherence, spin dephasing, interaction with lattice etc nuclei will be discussed.
We report frequency-resolved measurements of electron spin coherence in a (110) GaAs single quantum well waveguide inferred from the linewidth of an electromagnetically-induced resonance. With spectral resolution, asymmetry in the resonance lineshape is observed.
Experimental studies of nearly degenerate time-resolved Faraday rotation (TRFR) in GaAs and InGaAs quantum wells show that many body interactions between excitons strongly modify the TRFR response from the electron spin coherence.
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