Realization of a double-slit SQUID geometry by Fermi arc surface states in a WTe2 Weyl semimetal
O. O. Shvetsov, A. Kononov, A. V. Timonina, N. N. Kolesnikov, E. V. Deviatov
Institute of Solid State Physics of the Russian Academy of Sciences, 142432 Chernogolovka, Russia
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.