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首页> 外文期刊>Physical review >Nuclear spin polarization in the electron spin-flip Raman scattering of singly charged (In,Ga)As/GaAs quantum dots
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Nuclear spin polarization in the electron spin-flip Raman scattering of singly charged (In,Ga)As/GaAs quantum dots

机译：单电荷（In，Ga）As / GaAs量子点的电子自旋翻转拉曼散射中的核自旋极化

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摘要

We study the interplay between the dynamic nuclear spin polarization and resonant spin-flip Raman scattering of the resident electron in an ensemble of singly charged (In,Ga)As/GaAs quantum dots by using a two-color laser excitation scheme. The shift of the electron spin-flip Raman line gives a direct measure of the optically induced Overhauser shift, while the linewidth indicates nuclear spin fluctuations. The dynamic nuclear spin polarization leads only to a reduction in the electron spin splitting induced by wetting-layer excitation that is copolarized with the resonant quantum dot excitation. The respective mechanism of the two-color spin-flip Raman scattering is discussed together with the electron-nuclear hyperfine interaction and Pauli exclusion principle. The temporal evolution of the Overhauser shift further demonstrates a nuclear spin depolarization within several seconds depending strongly on the temperature.
机译：我们通过使用双色激光激发方案，研究了单电荷（In，Ga）As / GaAs量子点集合体中驻留电子的动态核自旋极化和共振自旋翻转拉曼散射之间的相互作用。电子自旋翻转拉曼线的位移直接测量了光学感应的Overhauser位移，而线宽则表明核自旋波动。动态核自旋极化仅导致由与共振量子点激发共极化的润湿层激发引起的电子自旋分裂的减少。讨论了两色自旋翻转拉曼散射的各自机理，以及电子核超精细相互作用和保利排斥原理。 Overhauser位移的时间演变进一步表明，在几秒钟之内，核自旋会去极化，这很大程度上取决于温度。

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  • 来源
    《Physical review》 |2015年第19期|195421.1-195421.5|共5页
  • 作者

    J. Debus; D. Kudlacik; V. F. Sapega; D. Dunker; P. Bohn; F. Passmann; D. Braukmann; J. Rautert; D. R. Yakovlev; D. Reuter; A. D. Wieck; M. Bayer;

  • 作者单位

    Experimentelle Physik 2, Technische Universitaet Dortmund, 44227 Dortmund, Germany;

    Experimentelle Physik 2, Technische Universitaet Dortmund, 44227 Dortmund, Germany;

    Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia;

    Experimentelle Physik 2, Technische Universitaet Dortmund, 44227 Dortmund, Germany;

    Experimentelle Physik 2, Technische Universitaet Dortmund, 44227 Dortmund, Germany;

    Experimentelle Physik 2, Technische Universitaet Dortmund, 44227 Dortmund, Germany;

    Experimentelle Physik 2, Technische Universitaet Dortmund, 44227 Dortmund, Germany;

    Experimentelle Physik 2, Technische Universitaet Dortmund, 44227 Dortmund, Germany;

    Experimentelle Physik 2, Technische Universitaet Dortmund, 44227 Dortmund, Germany,Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia;

    Department Physik, Universitaet Paderborn, 33098 Paderborn, Germany;

    Angewandte Festkoerperphysik, Ruhr-Universitaet Bochum, 44780 Bochum, Germany;

    Experimentelle Physik 2, Technische Universitaet Dortmund, 44227 Dortmund, Germany,Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia;

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  • 正文语种 eng
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  • 关键词

    quantum dots; electron resonance and relaxation; quantum dots;

    机译：量子点;电子共振和弛豫;量子点;

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