Weak-link Josephson Junctions Made from Topological Crystalline Insulators

被引：24

作者：

Snyder, R. A. ^{[1
,2
]}

Trimble, C. J. ^{[1
,2
]}

Rong, C. C. ^{[3
]}

Folkes, P. A. ^{[3
]}

Taylor, P. J. ^{[3
]}

Williams, J. R. ^{[1
,2
]}

机构：

[1] Univ Maryland, Dept Phys, Joint Quantum Inst, College Pk, MD 20742 USA

[2] Univ Maryland, Ctr Nanophys & Adv Mat, College Pk, MD 20742 USA

[3] Army Res Lab, Adelphi, MD 20783 USA

来源：

PHYSICAL REVIEW LETTERS | 2018年 / 121卷 / 09期

基金：

美国国家科学基金会;

关键词：

PHASE; SUPERCURRENT; BREAKING; FERMIONS; STATES;

D O I：

10.1103/PhysRevLett.121.097701

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on the fabrication of Josephson junctions using the topological crystalline insulator Pb0.5Sn0.5Te as the weak link. The properties of these junctions are characterized and compared to those fabricated with weak links of PbTe, a similar material yet topologically trivial. Most striking is the difference in the ac Josephson effect: junctions made with Pb0.5Sn0.5Te exhibit a rich subharmonic structure consistent with a skewed current-phase relation. This structure is absent in junctions fabricated from PbTe. A discussion is given on the origin of this effect as an indication of novel behavior arising from the topologically nontrivial surface state.

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页数：6

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