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Non-Markovian spin-resolved counting statistics and an anomalous relation between autocorrelations and cross correlations in a three-terminal quantum dot

机译：三端量子点中非马尔可夫自旋分辨计数统计量和自相关与互相关之间的异常关系

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摘要

We investigate the noise correlations of spin and charge currents through an electron spin resonance (ESR)-pumped quantum dot, which is tunnel coupled to three electrodes maintained at an equivalent chemical potential. A recursive scheme is employed with inclusion of the spin degrees of freedom to account for the spin-resolved counting statistics in the presence of non-Markovian effects due to coupling with a dissipative heat bath. For symmetric spin-up and spin-down tunneling rates, an ESR-induced spin flip mechanism generates a pure spin current without an accompanying net charge current. The stochastic tunneling of spin carriers, however, produces universal shot noises of both charge and spin currents, revealing the effective charge and spin units of quasiparticles in transport. In the case of very asymmetric tunneling rates for opposite spins, an anomalous relationship between noise autocorrelations and cross correlations is revealed, where super-Poissonian autocorrelation is observed in spite of a negative cross correlation. Remarkably, with strong dissipation strength, non-Markovian memory effects give rise to a positive cross correlation of the charge current in the absence of a super-Poissonian autocorrelation. These unique noise features may offer essential methods for exploiting internal spin dynamics and various quasiparticle tunneling processes in mesoscopic transport.
机译：我们通过电子自旋共振（ESR）泵浦的量子点研究了自旋电流和充电电流的噪声相关性，该量子点通过隧道耦合到维持在相等化学势的三个电极。采用递归方案，其中包括自旋自由度，以解决由于与耗散热浴耦合而导致的非马尔科夫效应的情况下自旋分辨的计数统计信息。对于对称的自举和自举隧穿速率，ESR诱导的自旋翻转机制会产生纯自旋电流，而不会产生净电荷。但是，自旋载流子的随机隧穿会产生电荷和自旋电流的通用散粒噪声，从而揭示了传输中准粒子的有效电荷和自旋单元。在反向旋转的隧道速率非常不对称的情况下，揭示了噪声自相关与互相关之间的异常关系，尽管互相关为负，但仍观察到超泊松自相关。值得注意的是，凭借强大的耗散强度，在没有超泊松自相关的情况下，非马尔可夫记忆效应会引起充电电流的正互相关。这些独特的噪声特征可能为在介观传输中利用内部自旋动力学和各种准粒子隧穿过程提供必要的方法。

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  • 来源
    《Physical review》 |2017年第3期|035154.1-035154.12|共12页
  • 作者

    JunYan Luo; Yiying Yan; Yixiao Huang; Li Yu; Xiao-Ling He; HuJun Jiao;

  • 作者单位

    Department of Physics, Zhejiang University of Science and Technology, Hangzhou 310023, China;

    Department of Physics, Zhejiang University of Science and Technology, Hangzhou 310023, China;

    Department of Physics, Zhejiang University of Science and Technology, Hangzhou 310023, China;

    Department of Physics, Zhejiang University of Science and Technology, Hangzhou 310023, China;

    Department of Physics, Zhejiang University of Science and Technology, Hangzhou 310023, China;

    Department of Physics, Shanxi University, Taiyuan, Shanxi 030006, China;

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