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Scientific article
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English

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

Published inPhysical review materials, vol. 4, no. 2, 021201
Publication date2020-02-10
First online date2020-02-10
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.

eng
Keywords
  • Optical conductivity
  • Weyl fermions
  • Transition metal dichalcogenides
  • Weyl semimetal
  • Fourier transform infrared spectroscopy
  • Infrared spectroscopy
  • Optical spectroscopy
Affiliation Not a UNIGE publication
Research group
Citation (ISO format)
SANTOS-COTTIN, D. et al. Low-energy excitations in type-II Weyl semimetal <i>T</i><sub><i>d</i></sub>−MoTe<sub>2</sub> evidenced through optical conductivity. In: Physical review materials, 2020, vol. 4, n° 2, p. 021201. doi: 10.1103/PhysRevMaterials.4.021201
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ISSN of the journal2475-9953
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