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arXiv 2103.14920cond-mat.mes-hallphysics.app-phquant-ph
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用非局域Hanbury-Brown和Twiss关联探讨超导体的拓扑性质

Probing the topological character of superconductors via non-local Hanbury-Brown and Twiss correlations

Tusaradri Mohapatra, Subhajit Pal, Colin Benjamin

摘要:

超导体可以根据是否保持时间反演对称性(TRS)、手征对称性和粒子-空穴对称性而被分类为拓扑或非拓扑。此外,拓扑超导体也可以分类为手性或螺旋形。本文利用Hanbury-Brown和Twiss(HBT)的散粒噪声关联和非局域电导,对金属/二维非常规超导体/金属结进行了探测,以更好地理解配对拓扑与非拓扑、螺旋与手征、节结与间隙。我们看到,HBT的相关性是不对称的非拓扑超导体的偏置电压的函数,而它们是对称的拓扑超导体的势垒强度无关。拓扑超导体与拓扑量子计算中重要的马约拉纳费米子有关。通过区分拓扑超导体和非拓扑超导体,我们的研究将有助于寻找马约拉纳费米子,这将有助于设计拓扑量子计算机。

英文摘要:

Superconductors can be classified as topological or not based on whether time-reversal symmetry (TRS), chiral symmetry, and particle-hole symmetry are preserved or not. Further, topological superconductors can also be classified as chiral or helical. In this paper, using Hanbury-Brown and Twiss (HBT) shot noise correlations and the non-local conductance, we probe metal/2D unconventional superconductor/metal junctions to understand better the pairing topological vs. non-topological or helical vs. chiral or nodal vs. gapful. We see that HBT correlations are asymmetric as a function of bias voltage for non-topological superconductors, whereas they are symmetric for topological superconductors irrespective of the barrier strength. Topological superconductors are associated with Majorana fermions which are important for topological quantum computation. By distinguishing topological superconductors from non-topological superconductors, our study will help search for Majorana fermions, which will aid in designing a topological quantum computer.

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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