Discovery of a weak topological insulating state and van Hove singularity in triclinic RhBi2

Lee, Kyungchan; Lange, Gunnar F.; Wang, Lin-Lin; Kuthanazhi, Brinda; Trevisan, Thaís V.; Jo, Na Hyun; Schrunk, Benjamin; Orth, Peter P.; Slager, Robert-Jan; Canfield, Paul C.; Kaminski, Adam

doi:10.1038/s41467-021-22136-w

Title: Discovery of a weak topological insulating state and van Hove singularity in triclinic RhBi2

Journal Article · Thu Mar 25 00:00:00 EDT 2021 · Nature Communications

DOI:https://doi.org/10.1038/s41467-021-22136-w· OSTI ID:1772659

Lee, Kyungchan; Lange, Gunnar F.;

; Kuthanazhi, Brinda;

; Jo, Na Hyun; Schrunk, Benjamin;

;

; Canfield, Paul C.;

Abstract Time reversal symmetric (TRS) invariant topological insulators (TIs) fullfil a paradigmatic role in the field of topological materials, standing at the origin of its development. Apart from TRS protected strong TIs, it was realized early on that more confounding weak topological insulators (WTI) exist. WTIs depend on translational symmetry and exhibit topological surface states only in certain directions making it significantly more difficult to match the experimental success of strong TIs. We here report on the discovery of a WTI state in RhBi ₂ that belongs to the optimal space group P $$$$\bar{1}$$$$ $\bar{1}$ , which is the only space group where symmetry indicated eigenvalues enumerate all possible invariants due to absence of additional constraining crystalline symmetries. Our ARPES, DFT calculations, and effective model reveal topological surface states with saddle points that are located in the vicinity of a Dirac point resulting in a van Hove singularity (VHS) along the (100) direction close to the Fermi energy ( E _F ). Due to the combination of exotic features, this material offers great potential as a material platform for novel quantum effects.

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Research Organization:: Ames Lab., Ames, IA (United States); Energy Frontier Research Centers (EFRC) (United States). Center for the Advancement of Topological Semimetals (CATS)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-07CH11358; 842901

OSTI ID:: 1772659

Alternate ID(s):: OSTI ID: 1772555

Report Number(s):: IS-J-10,442; 1855; PII: 22136

Journal Information:: Nature Communications, Journal Name: Nature Communications Vol. 12 Journal Issue: 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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