Electronic structure of a weak topological insulator RhBi<sub>2</sub>

Bulletin of the American Physical Society

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APS March Meeting 2021

Volume 66, Number 1

Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA

Session R45: Topological Insulators: Experiment

8:00 AM–11:00 AM, Thursday, March 18, 2021

Sponsoring Unit: DCMP
Chair: Hee Taek Yi, Rutgers, The State University of New Jersey

Abstract: R45.00011 : Electronic structure of a weak topological insulator RhBi₂*

10:00 AM–10:12 AM Live

Abstract

Presenter:

Kyungchan Lee
(Department of Physics and Astronomy, Iowa State University/Ames Laboratory)

Authors:

Kyungchan Lee
(Department of Physics and Astronomy, Iowa State University/Ames Laboratory)

Gunnar F Lange
(TCM Group, Cavendish Laboratory, University of Cambridge)

Lin-Lin Wang
(Department of Physics and Astronomy, Iowa State University/Ames Laboratory)

Brinda Kuthanazhi
(Department of Physics and Astronomy, Iowa State University/Ames Laboratory)

Thais Victa Trevisan
(Department of Physics and Astronomy, Iowa State University/Ames Laboratory)

Na Hyun Jo
(Department of Physics and Astronomy, Iowa State University/Ames Laboratory)

Benjamin Schrunk
(Department of Physics and Astronomy, Iowa State University/Ames Laboratory)

Peter Orth
(Department of Physics and Astronomy, Iowa State University/Ames Laboratory)

Robert-Jan Slager
(TCM Group, Cavendish Laboratory/ Department of Physics, University of Cambridge/ Harvard University)

Paul C Canfield
(Department of Physics and Astronomy, Iowa State University/Ames Laboratory)

Adam Kaminski
(Department of Physics and Astronomy, Iowa State University/Ames Laboratory)

We report a study of electronic structure of triclinic RhBi₂ using laser based angle resolved photoemission spectroscopy (ARPES), DFT calculations, and effective model. We observe two surface Dirac points demonstrating that RhBi₂ displays topological surface states (TSS) arising from WTI phase at (100) surface. Our results reveal TSS with saddle points that are located in the vicinity of a Dirac point resulting in a van Hove singularity close to the Fermi energy. Due to the combination of exotic features, this material offers great potential as a material platform for novel quantum effects.

*The research was performed at Ames Laboratory. Ames Laboratory is operated for the U.S. Department of Energy by the Iowa State University under Contract No. DE-AC02-07CH11358. This work was also supported by the Center for Advancement of Topological Semimetals, an Energy Frontier Research Center funded by the U.S. Department of Energy Office of Science, Office of Basic Energy Sciences, through the Ames Laboratory under its Contract No. DE-AC02-07CH11358 and Trinity college, the Marie Curie program under EC Grant agreement No. 842901 and the Winton program at the University of Cambridge.

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Bulletin of the American Physical Society

APS March Meeting 2021

Volume 66, Number 1

Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA

Session R45: Topological Insulators: Experiment

Abstract: R45.00011 : Electronic structure of a weak topological insulator RhBi2*

Presenter:

Authors:

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Abstract: R45.00011 : Electronic structure of a weak topological insulator RhBi₂*