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Quantum coherence at low temperatures in mesoscopic systems: Effect of disorder

机译：介观系统中低温下的量子相干：无序的影响

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摘要

We study the disorder dependence of the phase coherence time of quasi-one-dimensional wires and two-dimensional (2D) Hall bars fabricated from a high mobility GaAs/AlGaAs heterostructure. Using an original ion implantation technique, we can tune the intrinsic disorder felt by the 2D electron gas and continuously vary the system from the semiballistic regime to the localized one. In the diffusive regime, the phase coherence time follows a power law as a function of diffusion coefficient as expected in the Fermi-liquid theory, without any sign of low-temperature saturation. Surprisingly, in the semiballistic regime, it becomes independent of the diffusion coefficient. In the strongly localized regime we find a diverging phase coherence time with decreasing temperature, however, with a smaller exponent compared to the weakly localized regime.
机译：我们研究了由高迁移率GaAs / AlGaAs异质结构制成的准一维导线和二维（2D）霍尔棒的相干时间的无序依赖性。使用原始的离子注入技术，我们可以调整2D电子气所感觉到的固有紊乱，并不断地将系统从半弹道体制变为局部弹道体制。在扩散状态下，相干时间遵循费米-液体理论所期望的幂定律，作为扩散系数的函数，没有任何低温饱和的迹象。出乎意料的是，在半弹道体制中，它变得与扩散系数无关。在强局部化方案中，我们发现随着温度降低，相干时间发散，但是与弱局部化方案相比，指数相干时间更短。

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  • 来源
    《Physical review》 |2010年第24期|P.245306.1-245306.18|共18页
  • 作者

    Yasuhiro Niimi; Yannick Baines; Thibaut Capron; Dominique Mailly; Fang-Yuh Lo; Andreas D. Wieck; Tristan Meunier; Laurent Saminadayar; Christopher Baeuerle;

  • 作者单位

    Unstitut Neel, CNRS and Universite Joseph Fourier, BP 166, 38042 Grenoble, France Department of Physics, Tohoku University, 6-3 Aramaki-aza Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan Institute for Solid State Physics, University of Tokyo, Japan;

    rnUnstitut Neel, CNRS and Universite Joseph Fourier, BP 166, 38042 Grenoble, France;

    rnUnstitut Neel, CNRS and Universite Joseph Fourier, BP 166, 38042 Grenoble, France;

    rnLaboratoire de Photonique et Nanostructures, route de Nozay, 91460 Marcoussis, France;

    rnLehrstuhl fuer Angewandte Festkoerperphysik, Ruhr-Universitaet, Universitaetsstrasse 150, 44780 Bochum, Germany Department of Physics, National Taiwan Normal University, 88, Sec. 4, Ting-Chou Rd., Taipei City 11677, Taiwan;

    rnLehrstuhl fuer Angewandte Festkoerperphysik, Ruhr-Universitaet, Universitaetsstrasse 150, 44780 Bochum, Germany;

    rnUnstitut Neel, CNRS and Universite Joseph Fourier, BP 166, 38042 Grenoble, France;

    rnUnstitut Neel, CNRS and Universite Joseph Fourier, BP 166, 38042 Grenoble, France Institut Universitaire de France, 103 Boulevard Saint-Michel, 75005 Paris, France;

    rnUnstitut Neel, CNRS and Universite Joseph Fourier, BP 166, 38042 Grenoble, France;

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  • 正文语种 eng
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  • 关键词

    electronic transport in mesoscopic systems; quantum wires; decoherence; open systems; quantum statistical methods; weak or anderson localization;

    机译：介观系统中的电子传输;量子线退相干开放系统;量子统计方法;弱或安德森定位;

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