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Mesoscopic behavior of the transmission phase through confined correlated electronic systems

机译:通过受限相关电子系统的传输阶段的介观行为

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摘要

We investigate the effect of electronic correlations on the transmission phase of quantum coherent scatterers, considering quantum dots in the Coulomb blockade regime connected to two single-channel leads. We focus on transmission zeros and the associated π-phase lapses that have been observed in interferometric experiments. We numerically explore two types of models for quantum dots: (ⅰ) lattice models with up to eight sites, and (ⅱ) resonant level models with up to six levels. We identify different regimes of parameters where the presence of electronic correlations is responsible for the increase or the decrease of the number of transmission zeros versus electrochemical potential on the dot. We show that within the two models considered, interaction effects do not reproduce the universal behavior of alternating resonances and phase lapses, experimentally observed in many-electron Coulomb blockaded dots.
机译:考虑到与两个单通道引线相连的库仑阻滞机制中的量子点,我们研究了电子相关性对量子相干散射体传输相位的影响。我们关注在干涉测量实验中观察到的透射零点和相关的π相移。我们在数值上探索两种类型的量子点模型:(ⅰ)多达八个位点的晶格模型,和(ⅱ)多达六个能级的共振能级模型。我们确定了不同的参数制度,其中电子相关性的存在是造成传输零点数量相对于点上电化学势的增加或减少的原因。我们表明,在所考虑的两个模型中,相互作用效应不会重现交替共振和相移的普遍行为,这是在多电子库仑阻塞点中通过实验观察到的。

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  • 来源
    《Physical review》 |2013年第4期|045419.1-045419.16|共16页
  • 作者单位

    Instituto de Estructura de la Materia, CSIC, Serrano 123, 28006 Madrid, Spain;

    Institute of Nanotechnology, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany and Center of Functional Nanostructures, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany;

    Institut de Physique et Chimie des Materiaux de Strasbourg, UMR 7504, CNRS-UdS, 23 rue du Loess, BP 43,67034 Strasbourg Cedex 2, France;

    Institut de Physique et Chimie des Materiaux de Strasbourg, UMR 7504, CNRS-UdS, 23 rue du Loess, BP 43,67034 Strasbourg Cedex 2, France;

    Physics Department, University of Arizona 1118 E. Fourth Street, P.O. Box 210081, Tucson, Arizona 85721, USA and Departement de Physique Theorique, Universite de Geneve 24 Quai Ernest Ansermet, 1211 Geneve, Switzerland;

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