Record link: 
http://hdl.handle.net/20.500.12708/191283
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Title: 
Evidence for three-dimensional Dirac conical bands in TlBiSSe by optical and magneto-optical spectroscopy
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Citation: 
Le Mardelé, F., Wyzula, J., Mohelský, I., Nasrallah, S., Loh, M., Ben David, S., Toledano, O., Tolj, D., Novak, M., Eguchi, G., Paschen, S., Barisic, N., Chen, J., Kimura, A., Orlita, M., Rukelj, Z., Akrap, A., & Santos-Cottin, D. (2023). Evidence for three-dimensional Dirac conical bands in TlBiSSe by optical and magneto-optical spectroscopy. Physical Review B, 107(24), Article L241101. https://doi.org/10.1103/PhysRevB.107.L241101
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Publisher DOI: 
10.1103/PhysRevB.107.L241101
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Publication Type: 
Article - Original Research Article
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Language: 
English
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Authors: 
Le Mardelé, F. 
Wyzula, J. 
Mohelský, I. 
Nasrallah, S. 
Loh, M. 
Ben David, S. 
Toledano, O. 
Tolj, D. 
Novak, M. 
Eguchi, G. 
Paschen, S. 
Barisic, Neven 
Chen, J. 
Kimura, A. 
Orlita, M. 
Rukelj, Z. 
Akrap, Ana 
Santos-Cottin, D. 
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Organisational Unit: 
E138-02 - Forschungsbereich Correlations: Theory and Experiments 
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Journal: 
Physical Review B 
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ISSN: 
2469-9950
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Date (published): 
15-Jun-2023
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Publisher: 
AMER PHYSICAL SOC
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Peer reviewed: 
Yes
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Keywords: 
Topological materials; Dirac-bands; Dirac semimetal; magneto-optics
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Abstract: 
TlBiSSe is a rare realization of a three-dimensional semimetal with a conically dispersing band that has an optical response which is well isolated from other contributions in a broad range of photon energies. We report optical and magneto-optical spectroscopy on this material. When the compound is chemically tuned into a state of the lowest carrier concentration, we find a nearly linear frequency dependence of the optical conductivity below 0.5 eV. Landau level spectroscopy allows us to describe the system with a massive Dirac model, giving a gap 2Δ=32 meV and an in-plane velocity parameter vxy=4.0×105 m/s.
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Project (external): 
Swiss National Science Foundation
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Project ID: 
PP00P2_202661
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Research Areas: 
Metallic Materials: 50%
Materials Characterization: 50%
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Science Branch: 
1030 - Physik, Astronomie: 100%
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