Many-body Tunneling and Nonequilibrium Dynamics of Doublons in Strongly Correlated Quantum Dots.
Many-body Tunneling and Nonequilibrium Dynamics of Doublons in Strongly Correlated Quantum Dots.
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强相关量子点中双光子的多体隧道效应和非平衡动力学
DOI：
10.1038/s41598-017-02728-7
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发表时间：
2017-05-30
影响因子：
4.6
通讯作者：
Yan Y
中科院分区：
文献类型：
--
作者：
Hou W;Wang Y;Wei J;Zhu Z;Yan Y
量子隧穿在许多令人感兴趣的低温系统中主导着相干输运。本文通过非微扰求解安德森多杂质模型，提出了多体隧穿（MBT），并将其确定为在有序隧穿和共隧穿基础上的一个基本隧穿过程.我们表明，MBT涉及强关联系统中的doublons的动力学。在强关联区，与动力学双光子数成正比的MBT可以主导非共振输运。MBT电流对温度的T3/2依赖性被揭示，并且可以在实验中被识别为MBT的指纹。我们还证明了MBT可以支持双光子的相干长程隧穿，这与最近的超冷原子实验结果是一致的。作为一个基本的物理过程，MBT有望在一般量子系统中发挥重要作用。
Quantum tunneling dominates coherent transport at low temperatures in many systems of great interest. In this work we report a many–body tunneling (MBT), by nonperturbatively solving the Anderson multi-impurity model, and identify it a fundamental tunneling process on top of the well–acknowledged sequential tunneling and cotunneling. We show that the MBT involves the dynamics of doublons in strongly correlated systems. Proportional to the numbers of dynamical doublons, the MBT can dominate the off–resonant transport in the strongly correlated regime. A T 3/2–dependence of the MBT current on temperature is uncovered and can be identified as a fingerprint of the MBT in experiments. We also prove that the MBT can support the coherent long–range tunneling of doublons, which is well consistent with recent experiments on ultracold atoms. As a fundamental physical process, the MBT is expected to play important roles in general quantum systems.