Fermiology and superconductivity of topological surface states in PdTe2

O. J. Clark, M. J. Neat, K. Okawa, Lewis Bawden, Igor Marković, Federico Mazzola, Jiagui Feng, Veronika Sunko, J. M. Riley, W. Meevasana, J. Fujii, I Vobornik, T. Kim, M. Hoesch, T. Sasagawa, P. Wahl, M.S. Bahramy, P. D. C. King

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Abstract

We study the low-energy surface electronic structure of the transition-metal dichalcogenide superconductor PdTe2 by spin- and angle-resolved photoemission, scanning tunneling microscopy, and density-functional theory-based supercell calculations. Comparing PdTe2 with its sister compound PtSe2, we demonstrate how enhanced interlayer hopping in the Te-based material drives a band inversion within the antibonding p-orbital manifold well above the Fermi level. We show how this mediates spin-polarized topological surface states which form rich multivalley Fermi surfaces with complex spin textures. Scanning tunneling spectroscopy reveals type-II superconductivity at the surface, and moreover shows no evidence for an unconventional component of its superconducting order parameter, despite the presence of topological surface states.
Original languageEnglish
Article number156401
Number of pages7
JournalPhysical Review Letters
Volume120
Issue number15
DOIs
Publication statusPublished - 9 Apr 2018

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