Interlayer magnetophononic coupling in MnBi2Te4

Hari Padmanabhan (), Maxwell Poore, Peter K. Kim, Nathan Z. Koocher, Vladimir A. Stoica, Danilo Puggioni, Huaiyu Wang, Xiaozhe Shen, Alexander H. Reid, Mingqiang Gu, Maxwell Wetherington, Seng Huat Lee, Richard D. Schaller, Zhiqiang Mao, Aaron M. Lindenberg, Xijie Wang, James M. Rondinelli, Richard D. Averitt () and Venkatraman Gopalan ()
Additional contact information
Hari Padmanabhan: Pennsylvania State University
Maxwell Poore: University of California San Diego
Peter K. Kim: University of California San Diego
Nathan Z. Koocher: Northwestern University
Vladimir A. Stoica: Pennsylvania State University
Danilo Puggioni: Northwestern University
Huaiyu Wang: Pennsylvania State University
Xiaozhe Shen: SLAC National Accelerator Laboratory
Alexander H. Reid: SLAC National Accelerator Laboratory
Mingqiang Gu: Northwestern University
Maxwell Wetherington: Pennsylvania State University
Seng Huat Lee: Pennsylvania State University
Richard D. Schaller: Argonne National Laboratory
Zhiqiang Mao: Pennsylvania State University
Aaron M. Lindenberg: SLAC National Accelerator Laboratory
Xijie Wang: SLAC National Accelerator Laboratory
James M. Rondinelli: Northwestern University
Richard D. Averitt: University of California San Diego
Venkatraman Gopalan: Pennsylvania State University

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract The emergence of magnetism in quantum materials creates a platform to realize spin-based applications in spintronics, magnetic memory, and quantum information science. A key to unlocking new functionalities in these materials is the discovery of tunable coupling between spins and other microscopic degrees of freedom. We present evidence for interlayer magnetophononic coupling in the layered magnetic topological insulator MnBi2Te4. Employing magneto-Raman spectroscopy, we observe anomalies in phonon scattering intensities across magnetic field-driven phase transitions, despite the absence of discernible static structural changes. This behavior is a consequence of a magnetophononic wave-mixing process that allows for the excitation of zone-boundary phonons that are otherwise ‘forbidden’ by momentum conservation. Our microscopic model based on density functional theory calculations reveals that this phenomenon can be attributed to phonons modulating the interlayer exchange coupling. Moreover, signatures of magnetophononic coupling are also observed in the time domain through the ultrafast excitation and detection of coherent phonons across magnetic transitions. In light of the intimate connection between magnetism and topology in MnBi2Te4, the magnetophononic coupling represents an important step towards coherent on-demand manipulation of magnetic topological phases.

Date: 2022
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DOI: 10.1038/s41467-022-29545-5

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