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Lee K, Lange GF, Wang LL, Kuthanazhi B, Trevisan TV, Jo NH, Schrunk B, Orth PP, Slager RJ, Canfield PC, Kaminski A. Discovery of a weak topological insulating state and van Hove singularity in triclinic RhBi 2. Nat Commun 2021; 12:1855. [PMID: 33767195 PMCID: PMC7994551 DOI: 10.1038/s41467-021-22136-w] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Accepted: 02/19/2021] [Indexed: 11/10/2022] Open
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[Formula: see text], 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.
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Affiliation(s)
- Kyungchan Lee
- Ames Laboratory, Ames, IA, USA.,Department of Physics and Astronomy, Iowa State University, Ames, IA, USA
| | - Gunnar F Lange
- TCM Group, Cavendish Laboratory, University of Cambridge, Cambridge, UK
| | - Lin-Lin Wang
- Ames Laboratory, Ames, IA, USA.,Department of Physics and Astronomy, Iowa State University, Ames, IA, USA
| | - Brinda Kuthanazhi
- Ames Laboratory, Ames, IA, USA.,Department of Physics and Astronomy, Iowa State University, Ames, IA, USA
| | - Thaís V Trevisan
- Ames Laboratory, Ames, IA, USA.,Department of Physics and Astronomy, Iowa State University, Ames, IA, USA
| | - Na Hyun Jo
- Ames Laboratory, Ames, IA, USA.,Department of Physics and Astronomy, Iowa State University, Ames, IA, USA
| | - Benjamin Schrunk
- Ames Laboratory, Ames, IA, USA.,Department of Physics and Astronomy, Iowa State University, Ames, IA, USA
| | - Peter P Orth
- Ames Laboratory, Ames, IA, USA.,Department of Physics and Astronomy, Iowa State University, Ames, IA, USA
| | - Robert-Jan Slager
- TCM Group, Cavendish Laboratory, University of Cambridge, Cambridge, UK. .,Department of Physics, Harvard University, Cambridge, MA, USA.
| | - Paul C Canfield
- Ames Laboratory, Ames, IA, USA. .,Department of Physics and Astronomy, Iowa State University, Ames, IA, USA.
| | - Adam Kaminski
- Ames Laboratory, Ames, IA, USA. .,Department of Physics and Astronomy, Iowa State University, Ames, IA, USA.
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Cnubukov AV, Morr DK, Shakhnovich KA. Fermi surface evolution in underdoped cuprates. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/01418639608240357] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Andrey V. Cnubukov
- a Department of Physics , University of Wisconsin , Madison , Wisconsin , 53706 , USA
- b P. L. Kapitza Institute for Physical Problems , Moscow , Russia
| | - Dirk K. Morr
- a Department of Physics , University of Wisconsin , Madison , Wisconsin , 53706 , USA
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