Chirality blockade of Andreev reflection in a magnetic Weyl semimetal

被引：33

作者：

Bovenzi, N. ^{[1
]}

Breitkreiz, M. ^{[1
]}

Baireuther, P. ^{[1
]}

O'Brien, T. E. ^{[1
]}

Tworzydlo, J. ^{[2
]}

Adagideli, I. ^{[3
]}

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

机构：

[1] Leiden Univ, Inst Lorentz, POB 9506, NL-2300 RA Leiden, Netherlands

[2] Univ Warsaw, Inst Theoret Phys, Fac Phys, Ul Pasteura 5, PL-02093 Warsaw, Poland

[3] Sabanci Univ, Fac Engn & Nat Sci, TR-34956 Istanbul, Turkey

来源：

PHYSICAL REVIEW B | 2017年 / 96卷 / 03期

关键词：

TOPOLOGICAL INSULATORS; SUPERCONDUCTIVITY; DISCOVERY;

D O I：

10.1103/PhysRevB.96.035437

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A Weyl semimetal with broken time-reversal symmetry has a minimum of two species of Weyl fermions, distinguished by their opposite chirality, in a pair of Weyl cones at opposite momenta +/- K that are displaced in the direction of the magnetization. Andreev reflection at the interface between a Weyl semimetal in the normal state (N) and a superconductor (S) that pairs +/- K must involve a switch of chirality, otherwise it is blocked. We show that this "chirality blockade" suppresses the superconducting proximity effect when the magnetization lies in the plane of the NS interface. A Zeeman field at the interface can provide the necessary chirality switch and activate Andreev reflection.

引用

页数：13

共 35 条

[1] Mesoscopic superconductivity and high spin polarization coexisting at metallic point contacts on Weyl semimetal TaAs [J].

Aggarwal, Leena ;

Gayen, Sirshendu ;

Das, Shekhar ;

Kumar, Ritesh ;

Suess, Vicky ;

Felser, Claudia ;

Shekhar, Chandra ;

Sheet, Goutam .

NATURE COMMUNICATIONS, 2017, 8

[2] Weyl-Majorana solenoid [J].

Baireuther, P. ;

Tworzydlo, J. ;

Breitkreiz, M. ;

Adagideli, I. ;

Beenakker, C. W. J. .

NEW JOURNAL OF PHYSICS, 2017, 19

[3] Superconductivity in Weyl metals [J].

Bednik, G. ;

Zyuzin, A. A. ;

Burkov, A. A. .

PHYSICAL REVIEW B, 2015, 92 (03)

[4] Specular andreev Reflection in graphene [J].

Beenakker, C. W. J. .

PHYSICAL REVIEW LETTERS, 2006, 97 (06)

[5] Colloquium: Andreev reflection and Klein tunneling in graphene [J].

Beenakker, C. W. J. .

REVIEWS OF MODERN PHYSICS, 2008, 80 (04) :1337-1354

[6] JOSEPHSON CURRENT THROUGH A SUPERCONDUCTING QUANTUM POINT CONTACT SHORTER THAN THE COHERENCE LENGTH [J].

BEENAKKER, CWJ ;

VANHOUTEN, H .

PHYSICAL REVIEW LETTERS, 1991, 66 (23) :3056-3059

[7] TRANSITION FROM METALLIC TO TUNNELING REGIMES IN SUPERCONDUCTING MICRO-CONSTRICTIONS - EXCESS CURRENT, CHARGE IMBALANCE, AND SUPER-CURRENT CONVERSION [J].

BLONDER, GE ;

TINKHAM, M ;

KLAPWIJK, TM .

PHYSICAL REVIEW B, 1982, 25 (07) :4515-4532

[8] Weyl Semimetal in a Topological Insulator Multilayer [J].

Burkov, A. A. ;

Balents, Leon .

PHYSICAL REVIEW LETTERS, 2011, 107 (12)

[9] Specular Andreev reflection in inversion-symmetric Weyl semimetals [J].

Chen, Wei ;

Jiang, Liang ;

Shen, R. ;

Sheng, L. ;

Wang, B. G. ;

Xing, D. Y. .

EPL, 2013, 103 (02)

[10]

Cho G. Y., ARXIV11101939

← 1 2 3 4 →