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  Light-induced topological magnons in two-dimensional van der Waals magnets

Viñas Boström, E., Claassen, M., McIver, J. W., Jotzu, G., Rubio, A., & Sentef, M. A. (2020). Light-induced topological magnons in two-dimensional van der Waals magnets.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-C9FC-C Version Permalink: http://hdl.handle.net/21.11116/0000-0006-C9FD-B
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2007.01714.pdf (Preprint), 8MB
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2007.01714.pdf
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https://arxiv.org/abs/2007.01714 (Preprint)
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 Creators:
Viñas Boström, E.1, Author              
Claassen, M.2, Author
McIver, J. W.3, Author              
Jotzu, G.4, Author              
Rubio, A.1, 2, Author              
Sentef, M. A.5, 6, Author              
Affiliations:
1Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
2Center for Computational Quantum Physics, The Flatiron Institute, ou_persistent22              
3Non-equilibrium Transport in Quantum Materials, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_3185036              
4Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938293              
5Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_3012828              
6Institute for Theoretical Physics, University of Bremen, ou_persistent22              

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 Abstract: Driving a two-dimensional Mott insulator with circularly polarized light breaks time-reversal and inversion symmetry, which induces an optically-tunable synthetic scalar spin chirality interaction in the effective low-energy spin Hamiltonian. Here, we show that this mechanism can stabilize topological magnon excitations in honeycomb ferromagnets such as CrI3 and in optical lattices. We find that the irradiated quantum magnet is described by a Haldane model for magnons that hosts topologically-protected edge modes. We study the evolution of the magnon spectrum in the Floquet regime and via time propagation of the magnon Hamiltonian for a slowly varying pulse envelope. Compared to similar but conceptually distinct driving schemes based on the Aharanov-Casher effect, the dimensionless light-matter coupling parameter λ=eEa/ℏω at fixed electric field strength is enhanced by a factor ∼105. This increase of the coupling parameter allows to induce a topological gap of the order of Δ≈2 meV with realistic laser pulses, bringing an experimental realization of light-induced topological magnon edge states within reach.

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Language(s): eng - English
 Dates: 2020-07-03
 Publication Status: Published online
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: arXiv: 2007.01714
 Degree: -

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