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Fermiology and Superconductivity of Topological Surface States in PdTe2

DOI: 10.1103/PhysRevLett.120.156401 DOI Help

Authors: O. J. Clark (University of St. Andrews) , M. J. Neat (University of St. Andrews) , K. Okawa (Tokyo Institute of Technology) , L. Bawden (University of St Andrews, U.K.) , I. Markovic (University of St Andrews; Max Planck Institute for Chemical Physics of Solids) , Federico Mazzola (University of St. Andrews) , J. Feng (University of St. Andrews; Suzhou Institute of Nano-Tech. and Nanobionics (SINANO)) , V. Sunko (University of St. Andrews; Max Planck Institute for Chemical Physics of Solids) , J. M. Riley (University of St Andrews; Diamond Light Source) , W. Meevasana (Suranaree University of Technology; ThEP, Commission of Higher Education) , J. Fujii (Istituto Officina dei Materiali (IOM)-CNR) , I. Vobornik (Istituto Officina dei Materiali (IOM)-CNR) , T. K. Kim (Diamond Light Source) , M. Hoesch (Diamond Light Source) , T. Sasagawa (Tokyo Institute of Technology) , P. Wahl (University of St. Andrews) , M. S. Bahramy (The University of Tokyo; RIKEN center for Emergent Matter Science (CEMS)) , P. D. C. King (University of St. Andrews)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Letters , VOL 120

State: Published (Approved)
Published: April 2018
Diamond Proposal Number(s): 9500 , 12469 , 13438 , 16262

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.

Journal Keywords: Electronic structure; First-principles calculations; Semimetals; Spin polarization; Spin-orbit coupling; Superconductivity; Surface states; Topological materials; Topological phases of matter

Subject Areas: Materials, Physics


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