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arXiv 2602.15213cond-mat.supr-concond-mat.mes-hall
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微波辐照下具有Yu-Shiba-Rusinov态的约瑟夫森结中的二极管效应

Diode effect in microwave irradiated Josephson junctions with Yu-Shiba-Rusinov states

Institute for Theoretical Physics and Astrophysics, University of Würzburg(维尔茨堡大学理论物理与天体物理研究所);Würzburg-Dresden Cluster of Excellence ct.qmat(维尔茨堡-德累斯顿卓越集群 ct.qmat)

Aritra Lahiri, Marcel Polák, Björn Trauzettel

AI总结:

研究微波辐照下含有磁杂质诱导的Yu-Shiba-Rusinov态的约瑟夫森结,通过打破粒子-空穴对称性和反演对称性,实现临界电流的不对称性,并可通过微波参数高度调控,甚至达到完美二极管效应。

摘要:

我们研究了微波辐照下含有磁杂质诱导的Yu-Shiba-Rusinov态的约瑟夫森结中的临界电流。在两种条件下,即(i)通过非零势散射打破通常意义上的粒子-空穴对称性,以及(ii)通过势散射和/或磁矩的不等大小打破反演对称性,微波辐照会诱导出与相位无关的额外电流贡献。这导致相反电流极性下的不对称临界电流,而在没有微波辐照的相同结中不存在这种效应。这种不对称性可通过微波振幅和频率高度调控,我们甚至可以实现完美不对称性,即一个极性下的临界电流消失,类似于完美二极管。虽然Yu-Shiba-Rusinov态为实现显著不对称性提供了理想平台,但我们发现只要满足上述条件(i)和(ii),我们的提议并不必然依赖于它们。

英文摘要:

We investigate the critical current in microwave-irradiated Josephson junctions hosting Yu-Shiba-Rusinov states due to magnetic impurities. Under two conditions, namely, (i) the breaking of particle-hole symmetry in the normal sense by non-zero potential scattering, and (ii) the breaking of inversion symmetry either by unequal magnitudes of potential scattering and/or magnetic moments, microwave irradiation induces an additional phase-independent contribution to the current. This leads to asymmetric critical currents for opposite current polarities, an effect absent in the same junction without microwave irradiation. The asymmetry is highly tunable via the microwave amplitude and frequency, and we may even achieve perfect asymmetry where the critical current vanishes for one polarity, akin to a perfect diode. While Yu-Shiba-Rusinov states provide the ideal platform for a pronounced asymmetry, we find that as long as the two conditions (i) and (ii) above are met, our proposal does not necessarily depend upon them.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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