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Nonequilibrium dynamics in an optical transition from a neutral quantum dot to a correlated many-body state

机译:从中性量子点到相关多体态的光学跃迁中的非平衡动力学

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摘要

We investigate the effect of many-body interactions on the optical absorption spectrum of a charge-tunable quantum dot coupled to a degenerate electron gas. A constructive Fano interference between an indirect path, associated with an intradot exciton generation followed by tunneling, and a direct path, associated with the ionization of a valence-band quantum dot electron, ensures the visibility of the ensuing Fermi-edge singularity despite weak absorption strength. We find good agreement between experiment and renormalization group theory, but only when we generalize the Anderson impurity model to include a static hole and a dynamic dot-electron scattering potential. The latter highlights the fact that an optically active dot acts as a tunable quantum impurity, enabling the investigation of a new dynamic regime of Fermi-edge physics.
机译:我们研究耦合到简并电子气的电荷可调量子点的多体相互作用对光吸收光谱的影响。与内在激子的产生和随后的隧穿有关的间接路径与与价带量子点电子的电离有关的直接路径之间的建设性Fano干涉确保了尽管吸收较弱但随后产生的费米边缘奇点的可见性强度。我们发现实验与重归一化组理论之间有很好的一致性,但是只有当我们将安德森杂质模型推广到包括静态空穴和动态点电子散射势时,我们才能很好地达成共识。后者强调了一个事实,即光学活性点充当可调谐的量子杂质,从而使得能够研究费米边缘物理学的新的动态机制。

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  • 来源
    《Physical review》 |2013年第16期|161304.1-161304.5|共5页
  • 作者单位

    Institute of Quantum Electronics, ETH Zuerich, CH-8093, Zuerich, Switzerland;

    nstitute of Quantum Electronics, ETH Zuerich, CH-8093, Zuerich, Switzerland;

    Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-Universitaet Muenchen, D-80333 Muenchen, Germany;

    Institute of Quantum Electronics, ETH Zuerich, CH-8093, Zuerich, Switzerland;

    Institute of Quantum Electronics, ETH Zuerich, CH-8093, Zuerich, Switzerland;

    Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-Universitaet Muenchen, D-80333 Muenchen, Germany;

    Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-Universitaet Muenchen, D-80333 Muenchen, Germany;

    Institute of Quantum Electronics, ETH Zuerich, CH-8093, Zuerich, Switzerland;

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

    quantum dots; electron states at surfaces and interfaces; quantum dots; Ⅲ-Ⅴ and Ⅱ-Ⅵ semiconductors;

    机译:量子点;表面和界面的电子态;量子点;Ⅲ-Ⅴ和Ⅱ-Ⅵ族半导体;

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