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Direct measurement of spin dynamics in InAs/GaAs quantum dots using time-resolved resonance fluorescence

机译:使用时间分辨共振荧光直接测量InAs / GaAs量子点中的自旋动力学

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摘要

We temporally resolve the resonance fluorescence from an electron spin confined to a single self-assembled quantum dot to measure directly the spin's optical initialization and natural relaxation time scales at 4 K. Our measurements demonstrate that spin initialization occurs on the order of microseconds in the Faraday configuration when a laser resonantly drives the quantum dot transition. We show that the mechanism mediating the optically induced spin-flip changes from electron-nuclei interaction to hole-mixing interaction at 0.6 T external magnetic field. Spin relaxation measurements result in times on the order of milliseconds and suggest that a B~(-5) magnetic field dependence, due to spin-orbit coupling, is sustained all the way down to 2.2 T.
机译:我们暂时解析了局限在单个自组装量子点上的电子自旋的共振荧光,以直接测量自旋的光学初始化和4 K时的自然弛豫时间标度。我们的测量结果表明,自旋初始化发生在法拉第的微秒级激光共振驱动量子点跃迁时的结构。我们表明,在0.6 T外部磁场下,介导光学诱导的自旋翻转的机理从电子核相互作用变为空穴混合相互作用。自旋弛豫测量的时间量级为毫秒,并且表明自旋轨道耦合导致的B〜(-5)磁场依赖性一直持续到2.2T。

著录项

  • 来源
    《Physical review》 |2010年第3期|035332.1-035332.5|共5页
  • 作者单位

    Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom HFNL and Department of Modern Physics, University of Science and Technology of China, Hefei, 230026, China;

    Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom Physikalisches Institut, Ruprecht-Karls-Universitaet Heidelberg, Philosophenweg 12, Heidelberg 69120, Germany;

    Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom;

    Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom;

    Sol Voltaics AB, Scheelevdgen 17, Ideon Science Park, 223 70 Lund, Sweden;

    Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA;

    Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    charged excitons (trions); spin relaxation and scattering; photoluminescence, properties and materials;

    机译:带电激子自旋弛豫和散射;光致发光;性质和材料;

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