Fermion-Parity Anomaly of the Critical Supercurrent in the Quantum Spin-Hall Effect

被引：121

作者：

Beenakker, C. W. J. ^{[1
]}

Pikulin, D. I. ^{[1
]}

Hyart, T. ^{[1
]}

Schomerus, H. ^{[2
]}

Dahlhaus, J. P. ^{[1
]}

机构：

[1] Leiden Univ, Inst Lorentz, NL-2300 RA Leiden, Netherlands

[2] Univ Lancaster, Dept Phys, Lancaster LA1 4YB, England

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 01期

关键词：

JOSEPHSON-JUNCTIONS; MAJORANA FERMIONS; NANOWIRE; SUPERCONDUCTOR; SIGNATURE;

D O I：

10.1103/PhysRevLett.110.017003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The helical edge state of a quantum spin-Hall insulator can carry a supercurrent in equilibrium between two superconducting electrodes (separation L, coherence length xi). We calculate the maximum (critical) current I-c that can flow without dissipation along a single edge, going beyond the short-junction restriction L << xi of earlier work, and find a dependence on the fermion parity of the ground state when L becomes larger than xi. Fermion-parity conservation doubles the critical current in the low-temperature, long-junction limit, while for a short junction I-c is the same with or without parity constraints. This provides a phase-insensitive, dc signature of the 4 pi-periodic Josephson effect. DOI: 10.1103/PhysRevLett.110.017003

引用

页数：5

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