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 language | English |
|---|---|
| Article number | 156401 |
| Journal | Physical Review Letters |
| Volume | 120 |
| Issue number | 15 |
| DOIs | |
| Publication status | Published - 9 Apr 2018 |
Bibliographical note
Funding Information:We gratefully acknowledge support from the Leverhulme Trust, the Engineering and Physical Sciences Research Council, UK (Grants No.EP/M023427/1 and No.EP/I031014/1), the Royal Society, CREST, JST (No.JPMJCR16F1 and No.JPMJCR16F2), the Japan Society for Promotion of Science (Grant-in-Aid for Scientific Research (S); No.24224009 and (B); No.16H03847), the International Max-Planck Partnership for Measurement and Observation at the Quantum Limit and TRF and SUT Grant No.BRG5880010. This work has been partly performed in the framework of the nanoscience foundry and fine analysis (NFFA-MIUR Italy, Progetti Internazionali) facility. O.J.C., M.J.N., L.B., V.S., and J.M.R. acknowledge EPSRC for Ph.D. studentship support through Grants No.EP/K503162/1, No.EP/G03673X/1, No.EP/L505079/1, and No.EP/L015110/1. I.M. acknowledges Ph.D. studentship support from the IMPRS for the Chemistry and Physics of Quantum Materials. We thank Diamond Light Source (via Proposals No.SI9500, No.SI12469, No.SI13438, and No.SI16262) and Elettra synchrotron for access to the I05 and APE beam lines, respectively, that contributed to the results presented here.
Funding Information:
We gratefully acknowledge support from the Leverhulme Trust, the Engineering and Physical Sciences Research Council, UK (Grants No. EP/M023427/1 and No. EP/I031014/1), the Royal Society, CREST, JST (No. JPMJCR16F1 and No. JPMJCR16F2), the Japan Society for Promotion of Science (Grant-in-Aid for Scientific Research (S); No. 24224009 and (B); No. 16H03847), the International Max-Planck Partnership for Measurement and Observation at the Quantum Limit and TRF and SUT Grant No. BRG5880010. This work has been partly performed in the framework of the nanoscience foundry and fine analysis (NFFA-MIUR Italy, Progetti Internazionali) facility. O. J. C., M. J. N., L. B., V. S., and J. M. R. acknowledge EPSRC for Ph.D. studentship support through Grants No. EP/K503162/1, No. EP/G03673X/1, No. EP/L505079/1, and No. EP/L015110/1. I. M. acknowledges Ph.D. studentship support from the IMPRS for the Chemistry and Physics of Quantum Materials. We thank Diamond Light Source (via Proposals No. SI9500, No. SI12469, No. SI13438, and No. SI16262) and Elettra synchrotron for access to the I05 and APE beam lines, respectively, that contributed to the results presented here.
Publisher Copyright:
© 2018 American Physical Society.
ASJC Scopus subject areas
- General Physics and Astronomy