Optical Control of Spin Coherence in Singly Charged Quantum Dots

ORAL

Abstract

In singly charged dots, resonant light couples an electron in the ground state with a trion consisting of the electron and an excited electron-hole pair. We show that a polarized laser pulse, driving the electron/trion transition, coherently changes the spin state of the ground state electron. The controlled spin dynamics provide a mechanism for the optical orientation of an electron spin in a quantum dot. The theory is supported by experimental evidence of the electron spin coherence induced and controlled by optical pulses in (In,Ga)As/GaAs quantum dots.

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Authors

  • A. Shabaev

  • Al. L. Efros

    • Naval Research Laboratory, Washington DC, USA

  • I. A. Merkulov

    • A. F. Ioffe Institute, RAS, St. Petersburg, Russia

  • A. Greilich

  • R. Oulton

  • E. A. Zhukov

  • I. A. Yugova

  • D. R. Yakovlev

  • M. Bayer

    • Universit\"at Dortmund, Dortmund, Germany

  • V. Stavarache

  • D. Reuter

  • A. Wieck

    • Ruhr-Universit\"at Bochum, Bochum, Germany