Effect of pump-probe detuning on the Faraday rotation and ellipticity signals of mode-locked spins in InGaAs quantum dots
arXiv:1008.4245 · doi:10.1103/PhysRevB.82.155325
Abstract
We have studied the Faraday rotation and ellipticity signals in ensembles of singly-charged (In,Ga)As/GaAs quantum dots by pump-probe spectroscopy. For degenerate pump and probe we observe that the Faraday rotation signal amplitude first grows with increasing the time separation between pump and probe before a decay is observed for large temporal separations. The temporal behavior of the ellipticity signal, on the other hand, is regular: its amplitude decays with the separation. By contrast, for detuned pump and probe the Faraday rotation and ellipticty signals both exhibit similar and conventional behavior. The experimental results are well described in the frame of a recently developed microscopic theory [Phys. Rev. B 80, 104436 (2009)]. The comparison between calculations and experimental data allows us to provide insight into the spectral dependence of the electron spin precession frequencies and extract the electron g-factor dependence on energy.
arXiv comment9 pages, 7 figures
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- Microscopic dynamics of electron hopping in a semiconductor quantum well probed by spin-dependent photon echoes
- Interplay of spin mode locking and nuclei-induced frequency focusing in quantum dots
- Signatures of long-range spin-spin interactions in an (In,Ga)As quantum dot ensemble
- Spin-related phenomena in two-dimensional hopping regime in magnetic field
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- Faraday and Kerr rotation due to photoinduced orbital magnetization in two-dimensional electron gas
- Resonant spin amplification in Faraday geometry
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