Volume 122, Number 2, April 2018
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||19 June 2018|
Signature of Fermi arc surface states in Andreev reflection at the WTe2 Weyl semimetal surface
1 Institute of Solid State Physics of the Russian Academy of Sciences - Chernogolovka, Moscow District, 2 Academician Ossipyan str., 142432 Russia
2 Moscow Institute of Physics and Technology - Institutsky per. 9, Dolgoprudny, 141700 Russia
Received: 10 April 2018
Accepted: 28 May 2018
We experimentally investigate charge transport through the interface between a niobium superconductor and a three-dimensional WTe2 Weyl semimetal. In addition to classical Andreev reflection, we observe sharp non-periodic subgap resistance resonances. From an analysis of their positions, magnetic field and temperature dependences, we can interpret them as an analog of Tomasch oscillations for transport along the topological surface state across the region of proximity-induced superconductivity at the Nb-WTe2 interface. The observation of distinct geometrical resonances implies a specific transmission direction for carriers, which is a hallmark of the Fermi arc surface states.
PACS: 74.45.+c – Proximity effects; Andreev reflection; SN and SNS junctions / 73.23.-b – Electronic transport in mesoscopic systems / 73.40.-c – Electronic transport in interface structures
© EPLA, 2018
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