Infrared study of the multiband low-energy excitations of the topological antiferromagnet ${\mathrm{MnBi}}_{2}{\mathrm{Te}}_{4}$

Letter

Infrared study of the multiband low-energy excitations of the topological antiferromagnet ${MnBi}_{2} {Te}_{4}$

Bing Xu, Y. Zhang, E. H. Alizade, Z. A. Jahangirli, F. Lyzwa, E. Sheveleva, P. Marsik, Y. K. Li, Y. G. Yao, Z. W. Wang, B. Shen, Y. M. Dai, V. Kataev, M. M. Otrokov, E. V. Chulkov, N. T. Mamedov, and C. Bernhard

Phys. Rev. B 103, L121103 – Published 3 March 2021

Abstract

With infrared spectroscopy, we studied the bulk electronic properties of the topological antiferromagnet $Mn {Bi}_{2} {Te}_{4}$ with $T_{N} ≃ 25 K$ . With the support of band-structure calculations, we assign the intra- and interband excitations and determine the band gap of $E_{g} \approx 0.17$ 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, $ω_{pl}$ , below 300 K. The band reconstruction below $T_{N}$ yields an additional increase of $ω_{pl}$ 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.

Received 19 September 2020
Accepted 5 February 2021

DOI:https://doi.org/10.1103/PhysRevB.103.L121103

Physics Subject Headings (PhySH)

Optical conductivity Topological insulators

Topological materials

Infrared spectroscopy

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Bing Xu ¹, Y. Zhang², E. H. Alizade ³, Z. A. Jahangirli ^3,4, F. Lyzwa¹, E. Sheveleva ¹, P. Marsik¹, Y. K. Li^5,6, Y. G. Yao^5,6, Z. W. Wang^5,6,*, B. Shen ^2,†, Y. M. Dai⁷, V. Kataev ⁸, M. M. Otrokov^9,10, E. V. Chulkov^11,12,13, N. T. Mamedov ^3,‡, and C. Bernhard^1,§

¹University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Chemin du Musée 3, CH-1700 Fribourg, Switzerland
²Sate Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, Guangzhou, Guangdong 510275, China
³Institute of Physics, Azerbaijan National Academy of Sciences, Baku AZ1143, Azerbaijan
⁴Baku State University, Z. Khalilov str. 23, AZ1148, Baku, Azerbaijan
⁵Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement, Ministry of Education, School of Physics, Beijing Institute of Technology, Beijing 100081, China
⁶Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, Beijing Institute of Technology, Beijing 100081, China
⁷National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
⁸Leibniz Institute for Solid State and Materials Research IFW Dresden, 01069 Dresden, Germany
⁹Centro de Física de Materiales (CFM-MPC), Centro Mixto CSIC-UPV/EHU, 20018 Donostia-San Sebastián, Basque Country, Spain
¹⁰IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Basque Country, Spain
¹¹Donostia International Physics Center, 20018 Donostia-San Sebastian, Basque Country, Spain
¹²Departamento de Física de Materiales UPV/EHU, 20080 Donostia-San Sebastian, Basque Country, Spain
¹³Saint Petersburg State University, Laboratory of Electronic and Spin Structure of Nanosystems, 198504 Saint Petersburg, Russia

^*zhiweiwang@bit.edu.cn
^†shenbing@mail.sysu.edu.cn
^‡n.mamedov@physics.ab.az
^§christian.bernhard@unifr.ch

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Vol. 103, Iss. 12 — 15 March 2021

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Physical Review B

covering condensed matter and materials physics

Infrared study of the multiband low-energy excitations of the topological antiferromagnet ${MnBi}_{2} {Te}_{4}$

Bing Xu, Y. Zhang, E. H. Alizade, Z. A. Jahangirli, F. Lyzwa, E. Sheveleva, P. Marsik, Y. K. Li, Y. G. Yao, Z. W. Wang, B. Shen, Y. M. Dai, V. Kataev, M. M. Otrokov, E. V. Chulkov, N. T. Mamedov, and C. Bernhard

Phys. Rev. B 103, L121103 – Published 3 March 2021

Abstract

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Physical Review B

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

Bing Xu, Y. Zhang, E. H. Alizade, Z. A. Jahangirli, F. Lyzwa, E. Sheveleva, P. Marsik, Y. K. Li, Y. G. Yao, Z. W. Wang, B. Shen, Y. M. Dai, V. Kataev, M. M. Otrokov, E. V. Chulkov, N. T. Mamedov, and C. Bernhard

Phys. Rev. B 103, L121103 – Published 3 March 2021

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Infrared study of the multiband low-energy excitations of the topological antiferromagnet ${MnBi}_{2} {Te}_{4}$