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Low-energy excitations in type-II Weyl semimetal ${T}_{d}\text{\ensuremath{-}}{\mathrm{MoTe}}_{2}$ evidenced through optical conductivity

  • Santos-Cottin, David Department of Physics, University of Fribourg, Switzerland
  • Martino, Edoardo Department of Physics, University of Fribourg, Switzerland - IPHYS, EPFL, Lausanne, Switzerland
  • Le Mardelé, Florian Department of Physics, University of Fribourg, Switzerland
  • Witteveen, C. Department of Chemistry, University of Zürich, Switzerland - Physik-Institut der Universitat Zürich, Switzerland
  • Rohr, Fabian O. von Department of Chemistry, University of Zürich, Switzerland - Physik-Institut der Universitat Zürich, Switzerland
  • Homes, C. C. Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Upton, New York. USA
  • Rukelj, Z. Department of Physics, University of Fribourg, Switzerland - Department of Physics, Faculty of Science, University of Zagreb, Croatia
  • Akrap, Ana Department of Physics, University of Fribourg, Switzerland
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    10.02.2020
Published in:
  • Physical Review Materials. - 2020, vol. 4, no. 2, p. 021201
English 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.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
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Persistent URL
https://folia.unifr.ch/unifr/documents/308341
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