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arXiv 1503.06801cond-mat.mes-hallcond-mat.supr-con
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拓扑超导线结的电导谱

Conductance spectroscopy of topological superconductor wire junctions

F. Setiawan, P. M. R. Brydon, Jay D. Sau, S. Das Sarma

摘要:

本文研究了一维正常超导体(NS)结的零温输运性质。在拓扑NS结推广的Blonder-Tinkham-Klapwijk(BTK)形式下,我们解析地计算了两种拓扑超导体模型:无自旋内禀$p$波超导体和塞曼场中自旋轨道耦合$s$波超导体的微分电导.在这两种情况下,我们验证了零偏置电导是稳健的量化在$2e^2/h$的拓扑制度,而它需要在非拓扑阶段的非普适值。在拓扑状态下的电导谱在零偏置的某些参数制度,与自旋轨道耦合和势垒透明度的强度控制的峰宽发展。

英文摘要:

We study the zero-temperature transport properties of one-dimensional normal-superconductor (NS) junctions with topological superconductors across their topological transitions. Working within the Blonder-Tinkham-Klapwijk (BTK) formalism generalized for topological NS junctions, we analytically calculate the differential conductance for tunneling into two models of a topological superconductor: a spinless intrinsic $p$-wave superconductor and a spin-orbit-coupled $s$-wave superconductor in a Zeeman field. In both cases we verify that the zero-bias conductance is robustly quantized at $2e^2/h$ in the topological regime, while it takes nonuniversal values in the non-topological phase. The conductance spectra in the topological state develops a peak at zero bias for certain parameter regimes, with the peak width controlled by the strength of spin-orbit coupling and barrier transparency.

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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