FRACTIONAL A. C. JOSEPHSON EFFECT AS EVIDENCE OF TOPOLOGICAL HINGE STATES INADIRAC SEMIMETAL NiTe2

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Abstract

We experimentally investigate Josephson current between two 5 µm spaced superconducting indium leads,coupled to a NiTe2single crystal flake, which is a type-II Dirac semimetal. Under microwave irradiation, wedemonstrate a. c. Josephson effect at millikelvin temperatures as a number of Shapiro steps. In addition to theinteger (n= 1,2,3,4, ...) steps, we observe fractional ones at half-integer values n= 1/2,3/2,5/2and 7/2,which corresponds to πperiodicity of current-phase relationship. In contrast to previous investigations, we donot observe 4πperiodicity (disappearance of the odd n= 1,3,5, ... Shapiro steps), while the latter is usuallyconsidered as a fingerprint of helical surface states in Dirac semimetals and topological insulators. We argue,that our experiment confirms Josephson current through the topological hinge states in NiTe2: since one canexclude bulk supercurrent in 5 µm long Josephson junctions, interference of the hinge modes is responsible forthe πperiodicity, while stable odd Shapiro steps reflect chiral character of the topological hinge states.

About the authors

D. Yu. Kazmin

Institute of Solid State Physics of the Russian Academy of Sciences

Author for correspondence.
Email: dev@issp.ac.ru
Chernogolovka, Russia

V. D. Esin

Institute of Solid State Physics of the Russian Academy of Sciences

Email: dev@issp.ac.ru
Chernogolovka, Russia

A. V. Timonina

Institute of Solid State Physics of the Russian Academy of Sciences

Email: dev@issp.ac.ru
Chernogolovka, Russia

N. N. Kolesnikov

Institute of Solid State Physics of the Russian Academy of Sciences

Email: dev@issp.ac.ru
Chernogolovka, Russia

E. V. Deviatov

Institute of Solid State Physics of the Russian Academy of Sciences

Email: dev@issp.ac.ru
Chernogolovka, Russia

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