三角形量子点亚结构中的可调电流循环
Tunable current circulation in triangular quantum-dot metastructures
摘要：
量子点的制造和控制的进展允许实现可能表现出新颖的电输运现象的亚结构。在这里，我们研究了通过这样一个亚结构的电流，一个由放置在三角形顶点的量子点组成的系统。量子粒子的波动性导致在没有任何外部磁场的情况下在亚结构内的内部电流循环。揭示了稳态总电流与内环流之间的关系。通过精确计算量子输运中的电子相关性，我们给出了相图，显示了不同类型的电流循环可以作为量子点之间的相关强度和耦合的函数。最后，我们表明，电流循环的状态可以根据相互作用的局部空间分布而进一步增强或减弱，这表明即使在强相关状态下，单粒子散射机制也在发挥作用。我们建议实验实现实际的量子点亚结构，我们的预测可以直接测试。
英文摘要：
Advances in fabrication and control of quantum dots allow the realization of metastructures that may exhibit novel electrical transport phenomena. Here, we investigate the electrical current passing through one such metastructure, a system composed of quantum dots placed at the vertices of a triangle. The wave natural of quantum particles leads to internal current circulation within the metastructure in the absence of any external magnetic field. We uncover the relation between its steady-state total current and the internal circulation. By calculating the electronic correlations in quantum transport exactly, we present phase diagrams showing where different types of current circulation can be found as a function of the correlation strength and the coupling between the quantum dots. Finally, we show that the regimes of current circulation can be further enhanced or reduced depending on the local spatial distribution of the interactions, suggesting a single-particle scattering mechanism is at play even in the strongly-correlated regime. We suggest experimental realizations of actual quantum-dot metastructures where our predictions can be directly tested.
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