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首页> 外文期刊>Physical review >Germanium-based quantum emitters towards a time-reordering entanglement scheme with degenerate exciton and biexciton states
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Germanium-based quantum emitters towards a time-reordering entanglement scheme with degenerate exciton and biexciton states

机译：基于锗的量子发射体趋向于具有简并激子和双激子态的时间重排纠缠方案

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摘要

We address the radiative emission of individual germanium extrinsic centers in Al_(0.3)Ga_(0.7)As epilayers grown on germanium substrates. Microphotoluminescence experiments demonstrate the capability of high temperature emission (70 K) and complex exciton configurations (neutral exciton X and biexciton XX, positive X~+ and negative X~- charged excitons) of these quantum emitters. Finally, we investigate the renormalization of each energy level showing a large and systematic change of the binding energy of XX and X~+ from positive to negative values (from ～+5 meV up to ～-7 meV covering ～70 meV of the emission energy) with increasing quantum confinement. These light emitters, grown on a silicon substrate, may exhibit energy-degenerate X and XX energy levels. Furthermore, they emit at the highest detection efficiency window of Si-based single-photon detectors. These features render them a promising device platform for the generation of entangled photons in the time-reordering scheme.
机译：我们解决了在锗衬底上生长的Al_（0.3）Ga_（0.7）As外延层中各个锗外在中心的辐射发射问题。微光致发光实验证明了这些量子发射体具有高温发射（70 K）和复杂激子构型（中性激子X和双激子XX，正X〜+和负X〜带电激子）的能力。最后，我们研究了每个能级的重新归一化，表明XX和X〜+的结合能从正值到负值发生了大而系统的变化（从〜+ 5 meV到〜-7 meV，覆盖了〜70 meV的发射量）。能量）与增加的量子约束。这些生长在硅基板上的发光器可能会表现出能量退化的X和XX能级。此外，它们以基于硅的单光子探测器的最高探测效率窗口发射。这些功能使它们成为在时间重排方案中生成纠缠光子的有前途的设备平台。

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  • 来源
    《Physical review》 |2015年第20期|205316.1-205316.12|共12页
  • 作者

    Nicola Dotti; Francesco Sarti; Sergio Bietti; Alexander Azarov; Andrej Kuznetsov; Francesco Biccari; Anna Vinattieri; Stefano Sanguinetti; Marco Abbarchi; Massimo Gurioli;

  • 作者单位

    LENS, Dipartimento di Fisica, Universita di Firenze, Via Sansone 1, I-50019 Sesto Fiorentino, Italy;

    LENS, Dipartimento di Fisica, Universita di Firenze, Via Sansone 1, I-50019 Sesto Fiorentino, Italy;

    L-NESS and Dipartimento di Scienza dei Materiali, Universita di Milano Bicocca, Via Cozzi 53, I-20125 Milano, Italy;

    Department of Physics, University of Oslo, NO-0316 Oslo, Norway;

    Department of Physics, University of Oslo, NO-0316 Oslo, Norway;

    LENS, Dipartimento di Fisica, Universita di Firenze, Via Sansone 1, I-50019 Sesto Fiorentino, Italy;

    LENS, Dipartimento di Fisica, Universita di Firenze, Via Sansone 1, I-50019 Sesto Fiorentino, Italy;

    L-NESS and Dipartimento di Scienza dei Materiali, Universita di Milano Bicocca, Via Cozzi 53, I-20125 Milano, Italy;

    CNRS, Aix-Marseille Universite, Centrale Marseille, IM2NP, UMR 7334, Campus de St. Jerome, 13397 Marseille, France;

    LENS, Dipartimento di Fisica, Universita di Firenze, Via Sansone 1, I-50019 Sesto Fiorentino, Italy;

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  • 正文语种 eng
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  • 关键词

    excitons and related phenomena; impurity and defect levels; exchange interactions; photoluminescence, properties and materials;

    机译：激子和相关现象;杂质和缺陷水平;交流互动;光致发光;性质和材料;

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