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arXiv 2408.01289cond-mat.mes-hallcond-mat.supr-con
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多端超导结中的非厄米拓扑

Non-hermitian topology in multiterminal superconducting junctions

David Christian Ohnmacht, Valentin Wilhelm, Hannes Weisbrich, Wolfgang Belzig

AI总结:

本研究探讨了由正常金属或铁磁体诱导非厄米性的多端 Josephson 结中 Andreev 束缚态的拓扑特性,预测了不同系统中存在脆弱且稳定的非厄米拓扑相。

摘要:

近期在耗散控制方面的实验进展,为开放量子系统的非厄米哈密顿量提供了重要见解。这些非厄米系统展现出的拓扑特性尤为引人关注,它们源于异常点——此类系统独有的简并特性。在本研究中,我们关注由正常金属或铁磁体诱导非厄米性的多端 Josephson 结中的 Andreev 束缚态。通过研究几个具有不同合成维度和对称性的系统,我们预测在这些人工超导系统中存在脆弱且稳定的非厄米拓扑相。

英文摘要:

Recent experimental advancements in dissipation control have yielded significant insights into non-hermitian Hamiltonians for open quantum systems. Of particular interest are the topological characteristics exhibited by these non-hermitian systems, that arise from exceptional points - distinct degeneracies unique to such systems. In this study, we focus on Andreev bound states in multiterminal Josephson junctions with non-hermiticity induced by normal metal or ferromagnetic leads. By investigating several systems of different synthetic dimensions and symmetries, we predict fragile and stable non-hermitian topological phases in these engineered superconducting systems.

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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