Direct Optical Probe of Magnon Topology in Two-Dimensional Quantum Magnets

Viñas Boström, E.; Parvini, T. S.; McIver, J. W.; Rubio, A.; Kusminskiy, S. V.; Sentef, M. A.

doi:10.1103/PhysRevLett.130.026701

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Direct Optical Probe of Magnon Topology in Two-Dimensional Quantum Magnets

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Viñas Boström, E.
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free Electron Laser Science (CFEL);

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McIver, J. W.
Ultrafast Transport in Quantum Materials, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free Electron Laser Science (CFEL);
Department of Physics, Columbia University;

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Rubio, A.
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free Electron Laser Science (CFEL);
Center for Computational Quantum Physics, The Flatiron Institute;

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Sentef, M. A.
Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free Electron Laser Science (CFEL);

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https://arxiv.org/abs/2207.04745
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https://doi.org/10.1103/PhysRevLett.130.026701
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PhysRevLett.130.026701.pdf
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Citation

Viñas Boström, E., Parvini, T. S., McIver, J. W., Rubio, A., Kusminskiy, S. V., & Sentef, M. A. (2023). Direct Optical Probe of Magnon Topology in Two-Dimensional Quantum Magnets. Physical Review Letters, 130(2): 026701. doi:10.1103/PhysRevLett.130.026701.

Cite as: https://hdl.handle.net/21.11116/0000-000A-B4B6-D

Abstract

Controlling edge states of topological magnon insulators is a promising route to stable spintronics devices. However, to experimentally ascertain the topology of magnon bands is a challenging task. Here we derive a fundamental relation between the light-matter coupling and the quantum geometry of magnon states. This allows us to establish the two-magnon Raman circular dichroism as an optical probe of magnon topology in honeycomb magnets, in particular of the Chern number and the topological gap. Our results pave the way for interfacing light and topological magnons in functional quantum devices.