Campus Units

Materials Science and Engineering, Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

8-15-2016

Journal or Book Title

Physical Review B

Volume

94

Issue

8

First Page

081108(R)

DOI

10.1103/PhysRevB.94.081108

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.

Comments

This article is from Phys. Rev. B 94, 081108(R), doi:10.1103/PhysRevB.94.081108. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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