Optical control of electron spin coherence in CdTe-Cd,MgTe quantum wells - Condensed Matter > Mesoscale and Nanoscale PhysicsReport as inadecuate




Optical control of electron spin coherence in CdTe-Cd,MgTe quantum wells - Condensed Matter > Mesoscale and Nanoscale Physics - Download this document for free, or read online. Document in PDF available to download.

Abstract: Optical control of the spin coherence of quantum well electrons by shortlaser pulses with circular or linear polarization is studied experimentally andtheoretically. For that purpose the coherent electron spin dynamics in an-doped CdTe-Cd,MgTe quantum well structure was measured by time-resolvedpump-probe Kerr rotation, using resonant excitation of the negatively chargedexciton trion state. The amplitude and phase shifts of the electron spin beatsignal in an external magnetic field, that are induced by laser control pulses,depend on the pump-control delay and polarization of the control relative tothe pump pulse. Additive and non-additive contributions to pump-induced signaldue to the control are isolated experimentally. These contributions can be welldescribed in the framework of a two-level model for the optical excitation ofthe resident electron to the trion.



Author: E. A. Zhukov, D. R. Yakovlev, M. M. Glazov, L. Fokina, G. Karczewski, T. Wojtowicz, J. Kossut, M. Bayer

Source: https://arxiv.org/



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