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Fermiology and superconductivity of topological surface states in PdTe2

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Author(s)

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

School/Research organisations

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.
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Details

Original languageEnglish
Article number156401
Number of pages7
JournalPhysical Review Letters
Volume120
Issue number15
DOIs
Publication statusPublished - 9 Apr 2018

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