Department of Physics, Renmin University of China, Beijing, 100872, China.
School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China.
Sci Rep. 2017 May 30;7(1):2486. doi: 10.1038/s41598-017-02728-7.
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 -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.
在许多具有重要应用价值的系统中，量子隧穿在低温下主导相干输运。在这项工作中，我们通过非微扰求解安德森多杂质模型，报告了一种多体隧穿（MBT），并将其确定为在公认的顺序隧穿和协同隧穿之上的基本隧穿过程。我们表明，MBT 涉及强关联系统中双电子动力学。与动力学双电子的数量成正比，MBT 可以主导强关联区的非共振输运。我们揭示了 MBT 电流对温度的 T 依赖性，并可以将其作为实验中 MBT 的特征指纹。我们还证明了 MBT 可以支持双电子的相干长程隧穿，这与最近在超冷原子上的实验结果很好地一致。作为一种基本的物理过程，MBT 有望在一般量子系统中发挥重要作用。
