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- Title
Discovery of a weak topological insulating state and van Hove singularity in triclinic RhBi2.
- Authors
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
- 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 RhBi2 that belongs to the optimal space group P 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 (EF). Due to the combination of exotic features, this material offers great potential as a material platform for novel quantum effects. Weak topological insulators (WTI) remain difficult to be observed in experiments. Here, the authors discover a WTI state in RhBi2, where the topological surface states with saddle points result in a van Hove singularity along the (100) direction near Fermi energy.
- Subjects
TOPOLOGICAL insulators; FERMI energy; SURFACE states; TIME reversal; SPACE groups; DISCOVERY sport utility vehicles; VANS
- Publication
Nature Communications, 2021, Vol 12, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-021-22136-w