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Low-energy excitations in type-II Weyl semimetal Td−MoTe2 evidenced through optical conductivity


Santos-Cottin, David; Martino, Edoardo; Le Mardelé, Florian; Witteveen, Catherine; Von Rohr, Fabian O; Homes, Christopher C; Rukelj, Zoran; Akrap, Ana (2020). Low-energy excitations in type-II Weyl semimetal Td−MoTe2 evidenced through optical conductivity. Physical Review Materials, 4(2):021201.

Abstract

Molybdenum ditelluride, MoTe2, is a versatile material where the topological phase can be readily tuned by manipulating the associated structural phase transition. The fine details of the band structure of MoTe2, key to understanding its topological properties, have proven difficult to disentangle experientially due to the multiband character of the material. Through experimental optical conductivity spectra, we detect two strong low-energy interband transitions. Both are linked to excitations between spin-orbit split bands. The lowest interband transition shows a strong thermal shift, pointing to a chemical potential that dramatically decreases with temperature. With the help of ab initio calculations and a simple two-band model, we give qualitative and quantitative explanations of the main features in the temperature-dependent optical spectra up to 400 meV.

Abstract

Molybdenum ditelluride, MoTe2, is a versatile material where the topological phase can be readily tuned by manipulating the associated structural phase transition. The fine details of the band structure of MoTe2, key to understanding its topological properties, have proven difficult to disentangle experientially due to the multiband character of the material. Through experimental optical conductivity spectra, we detect two strong low-energy interband transitions. Both are linked to excitations between spin-orbit split bands. The lowest interband transition shows a strong thermal shift, pointing to a chemical potential that dramatically decreases with temperature. With the help of ab initio calculations and a simple two-band model, we give qualitative and quantitative explanations of the main features in the temperature-dependent optical spectra up to 400 meV.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Chemistry
07 Faculty of Science > Physics Institute
Dewey Decimal Classification:540 Chemistry
Scopus Subject Areas:Physical Sciences > General Materials Science
Physical Sciences > Physics and Astronomy (miscellaneous)
Language:English
Date:10 February 2020
Deposited On:05 Feb 2021 08:06
Last Modified:10 Feb 2021 23:15
Publisher:American Physical Society
ISSN:2475-9953
OA Status:Green
Publisher DOI:https://doi.org/10.1103/physrevmaterials.4.021201
Project Information:
  • : FunderSNSF
  • : Grant IDPZ00P2_174015
  • : Project TitleChemistry and Physics of Nitride Based Materials
  • : FunderSNSF
  • : Grant IDPP00P2_170544
  • : Project TitleTopological matter studied by optical spectroscopy

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