Optical control of spin coherence in singly charged (In,Ga)As/GaAs quantum dots

Abstract

Electron spin coherence has been generated optically in n-type modulation doped (In,Ga)As/GaAs quantum dots (QDs) which contain on average a single electron per dot. The coherence arises from resonant excitation of the QDs by circularly-polarized laser pulses, creating a coherent superposition of an electron and a trion state. Time dependent Faraday rotation is used to probe the spin precession of the optically oriented electrons about a transverse magnetic field. Spin coherence generation can be controlled by pulse intensity, being most efficient for (2n+1)pi-pulses.

5 pages, 4 figures

References in corpus (5)

• Single-shot read-out of an individual electron spin in a quantum dot
• Hyperfine interaction in a quantum dot: Non-Markovian electron spin dynamics
• Spin relaxation and decoherence of holes in quantum dots
• Stimulated and spontaneous optical generation of electron spin coherence in charged GaAs quantum dots
• Optical Read-Out and Initialization of an Electron Spin in a Single Quantum Dot

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