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

Autor:	Nakayama, Kosuke, Wang, Zhiwei, Trang, Chi Xuan, Souma, Seigo, Rienks, Emile D. L., Takahashi, Takashi, Ando, Yoichi, Sato, Takafumi
Rok vydání:	2018
Předmět:	Condensed Matter - Superconductivity Condensed Matter - Mesoscale and Nanoscale Physics
Zdroj:	Phys. Rev. B 98, 140502(R) (2018)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.98.140502
Popis:	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. Comment: 5 pages, 3 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1810.04913 Zobrazit plný text záznamu View this record from Arxiv