环流状态诱导的约瑟夫森二极管

Qi-Kai Shen, Yi Zhang
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引用次数: 0

摘要

我们研究了以环流态为隧道势垒的约瑟夫森结中超级电流的二极管效应。环流态是通过霍尔丹模型实现的,该模型保留了反转对称性,从而避免了二极管效应。我们演示了在单层和双层体系中如何打破反转对称性。在单层体系中,可以通过为霍尔丹模型引入子晶格交错电势或引入修正的霍尔丹模型来打破反转对称性;在双层体系中,可以通过在两层上设置相反的电流方向或直接施加垂直于两层的电场来打破反转对称性。我们进一步证明,二极管的效率可以通过层间耦合和电场强度或层间电压来调节。我们的研究结果为通过环流态打破时间反转对称性来实现约瑟夫森二极管效应提供了另一条途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Josephson diodes induced by the loop current states
We study the diode effect of the supercurrent in the Josephson junctions with the loop current states as the tunneling barrier. The loop current states are realized by the Haldane model which preserves the inversion symmetry and thus forbids the diode effect. We demonstrate how the inversion symmetry can be broken in the monolayer and bilayer systems. In the monolayer system, inversion symmetry can be broken by either introducing a sublattice staggered potential for the Haldane model or introducing a modified Haldane model, and in the bilayer system, it can be broken by either staking the two layers with opposite current directions or by directly applying an electric field perpendicular to the layers. We further show that the diode efficiency can be tuned by the interlayer coupling and the strength of the electric field or interlayer voltage. Our results provide another route to realize the Josephson diode effect by breaking the time-reversal symmetry through the loop-current states.
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