Journal article

Infrared study of the multiband low-energy excitations of the topological antiferromagnet MnBi2Te4

  • Xu, Bing University of Fribourg
  • Zhang, Y. Sate Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, Guangzhou, Guangdong 510275, China
  • Alizade, E. H. Institute of Physics, Azerbaijan National Academy of Sciences, Baku AZ1143, Azerbaijan
  • Jahangirli, Z. A. Institute of Physics, Azerbaijan National Academy of Sciences, Baku AZ1143, Azerbaijan
  • Lyzwa, Fryderyk University of Fribourg
  • Sheveleva, Evgeniia University of Fribourg
  • Marsik, Premysl University of Fribourg
  • Li, Y. K. Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement, Ministry of Education, School of Physics, Beijing Institute of Technology, Beijing 100081, China
  • Yao, Y. G. Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement, Ministry of Education, School of Physics, Beijing Institute of Technology, Beijing 100081, China
  • Wang, Z. W. Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement, Ministry of Education, School of Physics, Beijing Institute of Technology, Beijing 100081, China
  • Shen, B. Sate Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, Guangzhou, Guangdong 510275, China
  • Dai, Y. M. National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
  • Kataev, V. Leibniz Institute for Solid State and Materials Research IFW Dresden, 01069 Dresden, Germany
  • Otrokov, M. M. Centro de Física de Materiales (CFM-MPC), Centro Mixto CSIC-UPV/EHU, 20018 Donostia-San Sebastián, Basque Country, Spain
  • Chulkov, E. V. Donostia International Physics Center, 20018 Donostia-San Sebastian, Basque Country, Spain
  • Mamedov, N. T. Institute of Physics, Azerbaijan National Academy of Sciences, Baku AZ1143, Azerbaijan 4Baku State University, Z. Khalilov str. 23, AZ1148, Baku, Azerbaijan
  • Bernhard, Christian University of Fribourg
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    2021
Published in:
  • Physical Review B. - 2021, vol. 103, no. 12, p. L121103
English With infrared spectroscopy, we studied the bulk electronic properties of the topological antiferromagnet MnBi2Te4 with TN ≃ 25 K. With the support of band-structure calculations, we assign the intra- and interband excitations and determine the band gap of Eg ≈ 0.17 eV. We also obtain evidence for two types of conduction bands with light and very heavy carriers. The multiband free-carrier response gives rise to an unusually strong increase of the combined plasma frequency, ωpl, below 300 K. The band reconstruction below TN yields an additional increase of ωpl and a splitting of the transition between the two conduction bands by about 54 meV. Our study thus reveals a complex and strongly temperature-dependent multiband low-energy response that has important implications for the study of the surface states and device applications.
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/309276
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