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.
@article{arxiv.1712.04184,
title = {Fermiology and Superconductivity of Topological Surface States in PdTe$_2$},
author = {O. J. Clark and M. J. Neat and K. Okawa and L. Bawden and I. Marković and F. Mazzola and J. Feng and V. Sunko and J. M. Riley and W. Meevasana and J. Fujii and I. Vobornik and T. K. Kim and M. Hoesch and T. Sasagawa and P. Wahl and M. S. Bahramy and P. D. C. King},
journal= {arXiv preprint arXiv:1712.04184},
year = {2018}
}