Direct Observation of Magnon-Phonon Strong Coupling in Two-Dimensional Antiferromagnet at High Magnetic Fields

Sheng Liu, Andrés Granados del Águila, Dhiman Bhowmick, Chee Kwan Gan, T. Thu Ha Do, M. A. Prosnikov, David Sedmidubský, Zdenek Sofer, Peter C. M. Christianen, Pinaki Sengupta, and Qihua Xiong

Phys. Rev. Lett. 127, 097401 – Published 23 August 2021

Abstract

We report the direct observation of strong coupling between magnons and phonons in a two-dimensional antiferromagnetic semiconductor ${FePS}_{3}$ , via magneto-Raman spectroscopy at magnetic fields up to 30 Tesla. A Raman-active magnon at $121 {cm}^{- 1}$ is identified through Zeeman splitting in an applied magnetic field. At a field-driven resonance with a nearby phonon mode, a hybridized magnon-phonon quasiparticle is formed due to strong coupling between the two modes. We develop a microscopic model of the strong coupling in the two-dimensional magnetic lattice, which enables us to elucidate the nature of the emergent quasiparticle. Our polarized Raman results directly show that the magnons transfer their spin angular momentum to the phonons and generate phonon spin through the strong coupling.

Received 2 March 2021
Accepted 30 July 2021

DOI:https://doi.org/10.1103/PhysRevLett.127.097401

Physics Subject Headings (PhySH)

Magnons

Raman spectroscopy

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Sheng Liu^1,*, Andrés Granados del Águila^1,*, Dhiman Bhowmick ^1,*, Chee Kwan Gan ², T. Thu Ha Do¹, M. A. Prosnikov ³, David Sedmidubský ⁴, Zdenek Sofer⁴, Peter C. M. Christianen³, Pinaki Sengupta^1,†, and Qihua Xiong ^5,6,‡

¹Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371
²Institute of High Performance Computing, 1 Fusionopolis Way, 16-16 Connexis, Singapore 138632
³High Field Magnet Laboratory, HFML-EMFL, Radboud University, 6525 ED Nijmegen, Netherlands
⁴Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic
⁵State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China
⁶Beijing Academy of Quantum Information Sciences, Beijing 100193, China

^*These authors contributed equally to this work.
^†psengupta@ntu.edu.sg
^‡qihua_xiong@tsinghua.edu.cn

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Issue

Vol. 127, Iss. 9 — 27 August 2021

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