Charge-magnon conversion at the topological insulator/antiferromagnetic insulator interface

L. Y. Liao, Z. Y. Zhou, Y. J. Zhou, W. X. Zhu, F. Pan, and C. Song
Phys. Rev. B 102, 115152 – Published 24 September 2020
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Abstract

Efficient generation of magnons is highly desirable for magnonics. Here we theoretically investigate the charge-magnon conversion at the interface of topological insulator/antiferromagnetic insulator (AFMI), where the Dirac electrons and the antiferromagnetic magnons are coupled by the fluctuation of s-d exchange field. Our model reveals that the charge-magnon conversion efficiency for uncompensated interface is 2–3 orders higher than that for compensated interface. The conversion is more efficient with smaller magnon gap and larger s-d exchange coupling. We find a significant efficiency enhancement when the thickness of the AFMI is in the two-dimensional regime, where the magnons experience a quantum confinement effect. Bi2Te3/αMnTe bilayers are then proposed to be a promising system to realize strong charge-magnon conversion. Our work provides the principles of manipulating charge-magnon conversion and designing efficient charge-magnon conversion structure, which would help to improve the performance of antiferromagnetic magnonics, such as magnon transistor and magnon torque memories.

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  • Received 6 July 2020
  • Revised 5 September 2020
  • Accepted 9 September 2020

DOI:https://doi.org/10.1103/PhysRevB.102.115152

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

L. Y. Liao, Z. Y. Zhou, Y. J. Zhou, W. X. Zhu, F. Pan, and C. Song*

  • Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

  • *songcheng@mail.tsinghua.edu.cn

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Issue

Vol. 102, Iss. 11 — 15 September 2020

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