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  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. (2022). Direct optical probe of magnon topology in two-dimensional quantum magnets.

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2207.04745.pdf (Preprint), 2MB
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2207.04745.pdf
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File downloaded from arXiv at 2022-07-12
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2022
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https://arxiv.org/abs/2207.04745 (Preprint)
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 Creators:
Viñas Boström, E.1, 2, Author           
Parvini, T. S.3, Author
McIver, J. W.2, 4, 5, Author           
Rubio, A.1, 2, 6, Author           
Kusminskiy, S. V.7, 8, Author
Sentef, M. A.2, 9, Author           
Affiliations:
1Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
2Center for Free Electron Laser Science (CFEL), ou_persistent22              
3Institute of Physics, University of Greifswald, ou_persistent22              
4Ultrafast Transport in Quantum Materials, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_3185036              
5Department of Physics, Columbia University, ou_persistent22              
6Center for Computational Quantum Physics, The Flatiron Institute, ou_persistent22              
7Institute for Theoretical Solid State Physics, RWTH Aachen University, ou_persistent22              
8Max Planck Institute for the Science of Light, ou_persistent22              
9Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_3012828              

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Free keywords: Condensed Matter, Mesoscale and Nanoscale Physics, cond-mat.mes-hall, Condensed Matter, Materials Science, cond-mat.mtrl-sci
 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 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.

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 Dates: 2022-07-11
 Publication Status: Published online
 Pages: 6
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: arXiv: 2207.04745
 Degree: -

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