arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2207.01423cond-mat.mes-hallcond-mat.supr-conquant-ph
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广义边界条件下超导导线中的边态、Majorana费米子和拓扑序

Edge states, Majorana fermions and topological order in superconducting wires with generalized boundary conditions

A. Maiellaro, F. Romeo, F. Illuminati

摘要:

我们研究了一维拓扑超导体在模拟与外部环境耦合的一般边界条件影响下的性质。我们确定了一个一般的四参数分类的边界效应,并表明,粒子孔和反射对称性可以被打破或保存通过适当地固定的边界参数。当粒子-空穴对称性被破坏时,由于与外部自由度的杂化(准粒子中毒),边缘模的拓扑保护丧失。我们评估的鲁棒性的边缘模式在各种制度,考虑不同的量词的拓扑性质。特别是,我们调查的弹性的长距离,边到边的量子互信息和压缩纠缠,测量的Majorana激发的非局域相关性。这些结果除了与拓扑系统的开放动力学相关外,还为在现实条件下将低维拓扑系统适当嵌入纳米器件提供了有用的指导。

英文摘要:

We study the properties of one-dimensional topological superconductors under the influence of generic boundary conditions mimicking the coupling with external environments. We identify a general four-parameters classification of the boundary effects and show that particle-hole and reflection symmetries can be broken or preserved by appropriately fixing the boundary parameters. When the particle-hole symmetry is broken, the topological protection of the edge modes is lost due to the hybridization with the external degrees of freedom (quasiparticle poisoning). We assess the robustness of the edge modes in the various regimes by considering different quantifiers of topological properties. In particular, we investigate the resilience of the long-distance, edge-to-edge quantum mutual information and squashed entanglement, measuring the nonlocal correlations of the Majorana excitations. Besides their relevance for the open dynamics of topological systems, these results may provide a useful guide to the appropriate embedding of low-dimensional topological systems on nanodevices in realistic conditions.

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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