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Temperature-driven topological phase transition and intermediate Dirac semimetal phase in ${\mathrm{ZrTe}}_{5}$

  • Xu, Bing Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
  • Zhao, L. X. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China
  • Maršík, Premysl Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
  • Sheveleva, Evgeniia Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
  • Lyzwa, Fryderyk Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
  • Dai, Y. M. Center for Superconducting Physics and Materials, National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, China
  • Chen, G. F. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China
  • Qiu, X. G. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China
  • Bernhard, Christian Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
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    31.10.2018
Published in:
  • Physical Review Letters. - 2018, vol. 121, no. 18, p. 187401
English We present an infrared spectroscopy study of ZrTe5, which confirms a recent theoretical proposal that this material exhibits a temperature-driven topological quantum phase transition from a weak to a strong topological insulating state with an intermediate Dirac semimetal state around Tp ≃ 138 K. Our study details the temperature evolution of the energy gap in the bulk electronic structure. We found that the energy gap closes around Tp, where the optical response exhibits characteristic signatures of a Dirac semimetal state, i.e., a linear frequency-dependent optical conductivity extrapolating to the origin (after subtracting a weak Drude response). This finding allows us to reconcile previous diverging reports about the topological nature of ZrTe5 in terms of a variation of Tp that depends on the crystal growth condition.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
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Persistent URL
https://folia.unifr.ch/unifr/documents/307458
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