Fermiology and superconductivity of topological surface states in PdTe2
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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 inter-layer hopping in the Te-based material drives a band inversion within the anti-bonding p -orbital manifold well above the Fermi level. We show how this mediates spin-polarised topological surface states which form rich multi-valley 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.
Clark , O J , Neat , M J , Okawa , K , Bawden , L , Marković , I , Mazzola , F , Feng , J , Sunko , V , Riley , J M , Meevasana , W , Fujii , J , Vobornik , I , Kim , T , Hoesch , M , Sasagawa , T , Wahl , P , Bahramy , M S & King , P D C 2018 , ' Fermiology and superconductivity of topological surface states in PdTe 2 ' Physical Review Letters , vol 120 , no. 15 , 156401 . DOI: 10.1103/PhysRevLett.120.156401
Physical Review Letters
© 2018, American Physical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1103/PhysRevLett.120.156401
DescriptionWe gratefully acknowledge support from the Leverhulme Trust, the Engineering and Physical Sciences Research Council, UK (Grant Nos. EP/M023427/1 and EP/I031014/1), the Royal Society. JC, MJN, LB, VS, and JMR acknowledge EPSRC for PhD studentship support through grant Nos. EP/K503162/1, EP/G03673X/1, EP/L505079/1, and EP/L015110/1.
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