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VOLUME 107 (2018) | ISSUE 12 | PAGE 803
Realization of a double-slit SQUID geometry by Fermi arc surface states in a WTe2 Weyl semimetal
Abstract
We experimentally study electron transport between two superconducting indium leads, coupled to the WTe2 crystal surface. WTe2 is characterized by presence of Fermi arc surface states, as a predicted type-II Weyl semimetal candidate. We demonstrate Josephson current in unprecedentedly long 5 μm In-WTe2-In junctions, which is confirmed by I-V curves evolution with temperature and magnetic field. The Josephson current is mostly carried by the topological surface states, which we demonstrate in a double-slit superconducting quantum interference device geometry, realized by coupling the opposite WTe2 crystal surfaces.