Stimulated and Spontaneous Optical Generation of Electron Spin Coherence in Charged GaAs Quantum Dots

M. V. Gurudev Dutt, Jun Cheng, Bo Li, Xiaodong Xu, Xiaoqin Li, P. R. Berman, D. G. Steel, A. S. Bracker, D. Gammon, Sophia E. Economou, Ren-Bao Liu, and L. J. Sham
Phys. Rev. Lett. 94, 227403 – Published 9 June 2005

Abstract

We report on the coherent optical excitation of electron spin polarization in the ground state of charged GaAs quantum dots via an intermediate charged exciton (trion) state. Coherent optical fields are used for the creation and detection of the Raman spin coherence between the spin ground states of the charged quantum dot. The measured spin decoherence time, which is likely limited by the nature of the spin ensemble, approaches 10 ns at zero field. We also show that the Raman spin coherence in the quantum beats is caused not only by the usual stimulated Raman interaction but also by simultaneous spontaneous radiative decay of either excited trion state to a coherent combination of the two spin states.

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  • Received 3 August 2004

DOI:https://doi.org/10.1103/PhysRevLett.94.227403

©2005 American Physical Society

Authors & Affiliations

M. V. Gurudev Dutt1, Jun Cheng1, Bo Li1, Xiaodong Xu1, Xiaoqin Li1, P. R. Berman1, D. G. Steel1,*, A. S. Bracker2, D. Gammon2, Sophia E. Economou3, Ren-Bao Liu3, and L. J. Sham3

  • 1The H. M. Randall Laboratory of Physics, The University of Michigan, Ann Arbor, Michigan 48109, USA
  • 2The Naval Research Laboratory, Washington, District of Columbia 20375, USA
  • 3Department of Physics, The University of California-San Diego, La Jolla, California 92093, USA

  • *Electronic address: dst@umich.edu

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Vol. 94, Iss. 22 — 10 June 2005

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