Asymmetric mass acquisition in LaBi: Topological semimetal candidate

Yun Wu, Tai Kong, Lin Lin Wang, D. D. Johnson, Daixiang Mou, Lunan Huang, Benjamin Schrunk, S. L. Bud'Ko, P. C. Canfield, Adam Kaminski

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

We use our high resolution He-lamp-based, tunable laser-based angle-resolved photoemission spectroscopy measurements and density functional theory calculations to study the electronic properties of LaBi, a binary system that was proposed to be a member of a new family of topological semimetals. Both bulk and surface bands are present in the spectra. The dispersion of the surface state is highly unusual. It resembles a Dirac cone, but upon closer inspection we can clearly detect an energy gap. The bottom band follows roughly a parabolic dispersion. The dispersion of the top band remains very linear, "V" -shape like, with the tip approaching very closely to the extrapolated location of Dirac point. Such asymmetric mass acquisition is highly unusual and opens a possibility of a new topological phenomenon that has yet to be understood.

Original languageEnglish (US)
Article number081108
JournalPhysical Review B
Volume94
Issue number8
DOIs
StatePublished - Aug 18 2016
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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