手征p波超导体中的畴壁：电流通道
Domain wall in a chiral p-wave superconductor: a pathway for electrical current
摘要：
具有p+ip配对对称性的超导体的特征在于手征边缘态，但是这些手征边缘态在平衡状态下难以检测，因为所产生的磁场被迈斯纳效应屏蔽。边缘激发是不成对的马约拉纳费米子，它不能在费米能级附近传输电荷，这一事实阻碍了非平衡检测。本文证明了p_x+ip_y畴和p_x-ip_y畴之间的边界形成了电荷的单向通道。我们推导出一个产品规则的畴壁电导，它允许取消金属电极和超导体之间的隧道势垒的影响，并提供了一个独特的签名的拓扑超导体中的手征p波对称类。
英文摘要：
Superconductors with p+ip pairing symmetry are characterized by chiral edge states, but these are difficult to detect in equilibrium since the resulting magnetic field is screened by the Meissner effect. Nonequilibrium detection is hindered by the fact that the edge excitations are unpaired Majorana fermions, which cannot transport charge near the Fermi level. Here we show that the boundary between p_x+ip_y and p_x-ip_y domains forms a one-way channel for electrical charge. We derive a product rule for the domain wall conductance, which allows to cancel the effect of a tunnel barrier between metal electrodes and superconductor and provides a unique signature of topological superconductors in the chiral p-wave symmetry class.
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