Observation of Dirac-like energy band and unusual spectral line shape in quasi-one-dimensional superconductor Tl2Mo6Se6

Kosuke Nakayama, Zhiwei Wang, Chi Xuan Trang, Seigo Souma, Emile D.L. Rienks, Takashi Takahashi, Yoichi Ando, Takafumi Sato

Research output: Contribution to journalArticlepeer-review

Abstract

We have performed high-resolution angle-resolved photoemission spectroscopy of the quasi-one-dimensional (1D) topological superconductor candidate Tl2Mo6Se6 consisting of weakly coupled Mo3Se3 chains. We found a quasi-1D Fermi surface arising from a Dirac-like energy band, which is associated with the nonsymmorphic screw symmetry of the chains and predicted to trigger topological superconductivity. We observed a significant spectral-weight reduction over a wide energy range, together with a tiny Fermi-edge structure which exhibits a signature of a superconducting-gap opening below the superconducting-transition temperature. The observed quasi-1D Dirac-like band and its very small density of states point to an unconventional nature of superconductivity in Tl2Mo6Se6.

Original languageEnglish
Article number140502
JournalPhysical Review B
Volume98
Issue number14
DOIs
Publication statusPublished - 2018 Oct 10

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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