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首页> 外文期刊>Physical review >Interaction-induced charge and spin pumping through a quantum dot at finite bias
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Interaction-induced charge and spin pumping through a quantum dot at finite bias

机译：相互作用引起的电荷和自旋泵浦在有限偏置下通过量子点

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摘要

We investigate charge and spin transport through an adiabatically driven, strongly interacting quantum dot weakly coupled to two metallic contacts with finite bias voltage. Within a kinetic equation approach, we identify coefficients of response to the time-dependent external driving and relate these to the concepts of charge and spin emissivities previously discussed within the time-dependent scattering matrix approach. Expressed in terms of auxiliary vector fields, the response coefficients allow for a straightforward analysis of recently predicted interaction-induced pumping under periodic modulation of the gate and bias voltage [Reckermann et al., Phys. Rev. Lett. 104, 226803 (2010)]. We perform a detailed study of this effect and the related adiabatic Coulomb blockade spectroscopy, and, in particular, extend it to spin pumping. Analytic formulas for the pumped charge and spin in the regimes of small and large driving amplitude are provided for arbitrary bias. In the absence of a magnetic field, we obtain a striking, simple relation between the pumped charge at zero bias and at bias equal to the Coulomb charging energy. At finite magnetic field, there is a possibility to have interaction-induced pure spin pumping at this finite bias value, and generally, additional features appear in the pumped charge. For large-amplitude adiabatic driving, the magnitude of both the pumped charge and spin at the various resonances saturates at values which are independent of the specific shape of the pumping cycle. Each of these values provides an independent, quantitative measure of the junction asymmetry.
机译：我们研究了通过绝热驱动的，强烈相互作用的量子点的电荷和自旋输运，该量子点弱耦合到具有有限偏置电压的两个金属触点。在动力学方程方法中，我们确定对时间相关的外部驱动的响应系数，并将其与先前在时间相关的散射矩阵方法中讨论的电荷和自旋发射率的概念相关联。以辅助矢量场的形式表示，响应系数允许对在栅极和偏置电压的周期性调制下最近预测的相互作用引起的泵浦进行简单分析[Reckermann等，Phys。牧师104，226803（2010）]。我们对此效果和相关的绝热库仑阻塞光谱进行了详细的研究，尤其是将其扩展到自旋泵浦。为任意偏置提供了在小和大驱动幅度范围内泵送电荷和自旋的解析公式。在没有磁场的情况下，我们获得了在零偏压和等于库仑充电能量的偏压下泵浦电荷之间的惊人简单关系。在有限的磁场下，有可能在此有限的偏置值下进行相互作用引起的纯自旋泵浦，通常，在泵浦的电荷中会出现其他特征。对于大振幅绝热驱动，在各种谐振下泵浦电荷和自旋的幅度都饱和在一个值上，该值与泵浦周期的特定形状无关。这些值中的每一个都提供对结不对称性的独立，定量度量。

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  • 来源
    《Physical review》 |2012年第24期|245308.1-245308.16|共16页
  • 作者

    Hernan L. Calvo; Laura Classen; Janine Splettstoesser; Maarten R. Wegewijs;

  • 作者单位

    Institut fuer Theorie der Statistischen Physik, RWTH Aachen University, 52056 Aachen, Germany and JARA - Fundamentals of Future Information Technology;

    Institut fuer Theorie der Statistischen Physik, RWTH Aachen University, 52056 Aachen, Germany and JARA - Fundamentals of Future Information Technology;

    Institut fuer Theorie der Statistischen Physik, RWTH Aachen University, 52056 Aachen, Germany and JARA - Fundamentals of Future Information Technology;

    Institut fuer Theorie der Statistischen Physik, RWTH Aachen University, 52056 Aachen, Germany,Peter Gruenberg Institut, Forschungszentrum Juelich, 52425 Juelich, Germany, and JARA - Fundamentals of Future Information Technology;

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  • 正文语种 eng
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  • 关键词

    spin polarized transport; coulomb blockade; single-electron tunneling; quantum dots;

    机译：自旋极化传输;库仑封锁;单电子隧穿量子点;

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