Chiral quasiparticle tunneling between quantum Hall edges in proximity with a superconductor

被引：5

作者：

Wei, M. T. ^{[1
]}

Draelos, A. W. ^{[1
]}

Seredinski, A. ^{[1
]}

Ke, C. T. ^{[1
]}

Li, H. ^{[2
]}

Mehta, Y. ^{[2
]}

Watanabe, K. ^{[3
]}

Taniguchi, T. ^{[3
]}

Yamamoto, M. ^{[4
]}

Tarucha, S. ^{[4
]}

Finkelstein, G. ^{[1
]}

Amet, F. ^{[2
]}

Borzenets, I., V ^{[5
]}

机构：

[1] Duke Univ, Dept Phys, Durham, NC 27708 USA

[2] Appalachian State Univ, Dept Phys & Astron, Boone, NC 28607 USA

[3] NIMS, Adv Mat Lab, Tsukuba, Ibaraki 3050044, Japan

[4] RIKEN, CEMS, Wako, Saitama 3510198, Japan

[5] City Univ Hong Kong, Dept Phys, Kowloon, Hong Kong, Peoples R China

来源：

PHYSICAL REVIEW B | 2019年 / 100卷 / 12期

关键词：

JOSEPHSON-JUNCTIONS; GRAPHENE; SUPERCURRENT;

D O I：

10.1103/PhysRevB.100.121403

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study a two-terminal graphene Josephson junction with contacts shaped to form a narrow constriction, less than 100 nm in length. The contacts are made from type-II superconducting contacts and able to withstand magnetic fields high enough to reach the quantum Hall regime in graphene. In this regime, the device conductance is determined by edge states, plus the contribution from the constricted region. In particular, the constriction area can support supercurrents up to fields of similar to 2.5 T. Additionally, enhanced conductance is observed through a wide range of magnetic fields and gate voltages. This additional conductance and the appearance of supercurrent is attributed to the tunneling between counterpropagating quantum Hall edge states along opposite superconducting contacts.

引用

页数：5

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