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

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Xu B., Zhang Y., Alizade E., Jahangirli Z., Lyzwa F., Sheveleva E., ...daha çox

Physical Review B, vol.103, no.12, 2021 (SCI-Expanded, Scopus) identifier

  • Nəşrin Növü: Article / Article
  • Cild: 103 Say: 12
  • Nəşr tarixi: 2021
  • Doi nömrəsi: 10.1103/physrevb.103.l121103
  • jurnalın adı: Physical Review B
  • Jurnalın baxıldığı indekslər: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Compendex, INSPEC, zbMATH
  • Açıq Arxiv Kolleksiyası: Məqalə
  • Adres: Bəli

Qısa məlumat

With infrared spectroscopy, we studied the bulk electronic properties of the topological antiferromagnet MnBi2Te4 with TN≃25K. 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.