Optical control of spin coherence in singly charged (In,Ga)As/GaAs quantum dots
Greilich, A. · Oulton, R. · Zhukov, E. A. · Yugova, I. A. · Yakovlev, D. R. · Bayer, M. · Shabaev, A. · Efros, Al. L. · Merkulov, I. A. · Stavarache, V. · Reuter, D. · Wieck, A.
الأصل · EN
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.
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