Publication Date

4-17-2019

Department

Ames Laboratory; Physics and Astronomy

Campus Units

Ames Laboratory, Physics and Astronomy

OSTI ID+

1514886

Report Number

IS-J 9936

DOI

10.1103/PhysRevB.99.161113

Journal Title

Physical Review B

Volume Number

99

Issue Number

16

First Page

161113(R)

Abstract

We use tunable, vacuum ultraviolet laser based angle-resolved photoemission spectroscopy and density functional theory (DFT) calculations to study the electronic properties of Dirac semimetal candidate cubic PtBi 2 . In addition to bulk electronic states we also find surface states in PtBi 2 , which is expected as PtBi 2 was theoretically predicated to be a candidate Dirac semimetal. The surface states are also well reproduced from DFT band calculations. Interestingly, the topological surface states form Fermi contours rather than double Fermi arcs that were observed in Na 3 Bi . The surface bands forming the Fermi contours merge with bulk bands in proximity to the Dirac point projections, as expected. Our data confirm the existence of Dirac states in PtBi 2 and reveal the fragility of the Fermi arcs in Dirac semimetals. Because the Fermi arcs are not topologically protected in general, they can be deformed into Fermi contours, as proposed by M. Kargarian et al. [Proc. Natl. Acad. Sci. USA 113, 8648 (2016)]. Our results demonstrate the validity of this theory in PtBi 2 .

DOE Contract Number(s)

AC02-07CH11358; GBMF4411; DMR-1420451

Language

en

Publisher

Iowa State University Digital Repository, Ames IA (United States)

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