Discovery of a weak topological insulating state and van Hove singularity in triclinic RhBi2
Abstract
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 $$$$\bar{1}$$$$ , 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.
- Authors:
- Publication Date:
- Research Org.:
- Ames Lab., Ames, IA (United States); Energy Frontier Research Centers (EFRC) (United States). Center for the Advancement of Topological Semimetals (CATS)
- Sponsoring Org.:
- USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
- OSTI Identifier:
- 1772659
- Alternate Identifier(s):
- OSTI ID: 1772555
- Report Number(s):
- IS-J-10,442
Journal ID: ISSN 2041-1723; 1855; PII: 22136
- Grant/Contract Number:
- AC02-07CH11358; 842901
- Resource Type:
- Published Article
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Name: Nature Communications Journal Volume: 12 Journal Issue: 1; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Electronic properties and materials; Topological insulators
Citation Formats
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., and Kaminski, Adam. Discovery of a weak topological insulating state and van Hove singularity in triclinic RhBi2. United Kingdom: N. p., 2021.
Web. doi:10.1038/s41467-021-22136-w.
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. Discovery of a weak topological insulating state and van Hove singularity in triclinic RhBi2. United Kingdom. https://doi.org/10.1038/s41467-021-22136-w
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., and Kaminski, Adam. Thu .
"Discovery of a weak topological insulating state and van Hove singularity in triclinic RhBi2". United Kingdom. https://doi.org/10.1038/s41467-021-22136-w.
@article{osti_1772659,
title = {Discovery of a weak topological insulating state and van Hove singularity in triclinic RhBi2},
author = {Lee, Kyungchan and Lange, Gunnar F. and Wang, Lin-Lin and Kuthanazhi, Brinda and Trevisan, Thaís V. and Jo, Na Hyun and Schrunk, Benjamin and Orth, Peter P. and Slager, Robert-Jan and Canfield, Paul C. and Kaminski, Adam},
abstractNote = {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}$$ 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.},
doi = {10.1038/s41467-021-22136-w},
journal = {Nature Communications},
number = 1,
volume = 12,
place = {United Kingdom},
year = {Thu Mar 25 00:00:00 EDT 2021},
month = {Thu Mar 25 00:00:00 EDT 2021}
}
https://doi.org/10.1038/s41467-021-22136-w
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