Direct observation of topological magnon polarons in a multiferroic material

Song Bao, Zhao-Long Gu, Yanyan Shangguan, Zhentao Huang, Junbo Liao, Xiaoxue Zhao, Bo Zhang, Zhao-Yang Dong, Wei Wang, Ryoichi Kajimoto, Mitsutaka Nakamura, Tom Fennell, Shun-Li Yu (), Jian-Xin Li () and Jinsheng Wen ()
Additional contact information
Song Bao: Nanjing University
Zhao-Long Gu: Nanjing University
Yanyan Shangguan: Nanjing University
Zhentao Huang: Nanjing University
Junbo Liao: Nanjing University
Xiaoxue Zhao: Nanjing University
Bo Zhang: Nanjing University
Zhao-Yang Dong: Nanjing University of Science and Technology
Wei Wang: Nanjing University of Posts and Telecommunications
Ryoichi Kajimoto: Japan Atomic Energy Agency (JAEA)
Mitsutaka Nakamura: Japan Atomic Energy Agency (JAEA)
Tom Fennell: Paul Scherrer Institute (PSI)
Shun-Li Yu: Nanjing University
Jian-Xin Li: Nanjing University
Jinsheng Wen: Nanjing University

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Magnon polarons are novel elementary excitations possessing hybrid magnonic and phononic signatures, and are responsible for many exotic spintronic and magnonic phenomena. Despite long-term sustained experimental efforts in chasing for magnon polarons, direct spectroscopic evidence of their existence is hardly observed. Here, we report the direct observation of magnon polarons using neutron spectroscopy on a multiferroic Fe2Mo3O8 possessing strong magnon-phonon coupling. Specifically, below the magnetic ordering temperature, a gap opens at the nominal intersection of the original magnon and phonon bands, leading to two separated magnon-polaron bands. Each of the bands undergoes mixing, interconverting and reversing between its magnonic and phononic components. We attribute the formation of magnon polarons to the strong magnon-phonon coupling induced by Dzyaloshinskii-Moriya interaction. Intriguingly, we find that the band-inverted magnon polarons are topologically nontrivial. These results uncover exotic elementary excitations arising from the magnon-phonon coupling, and offer a new route to topological states by considering hybridizations between different types of fundamental excitations.

Date: 2023
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DOI: 10.1038/s41467-023-41791-9

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