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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. SciPost Physics, 9(4): 061. doi:10.21468/SciPostPhys.9.4.061.

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SciPostPhys_9_4_061.pdf (Publisher version), 8MB
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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              
3Ultrafast 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 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: 2020-08-182020-10-282020-10-30
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: arXiv: 2007.01714
DOI: 10.21468/SciPostPhys.9.4.061
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Project name : We acknowledge inspiring discussions with Abhisek Kole, Jin Zhang, Lede Xian and Clau- dio Verdozzi. We acknowledge support by the Max Planck Institute - New York City Center for Non-Equilibrium Quantum Phenomena. MAS acknowledges support by the DFG through the Emmy Noether programme (SE 2558/2-1). This work was supported by the European Research Council (ERC-2015-AdG694097), the Cluster of Excellence “Advanced Imaging of Matter” (AIM), and Grupos Consolidados (IT1249-19). The Flatiron Institute is a Division of the Simons Foundation.
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Title: SciPost Physics
Source Genre: Journal
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Publ. Info: Amsterdam : SciPost Foundation
Pages: - Volume / Issue: 9 (4) Sequence Number: 061 Start / End Page: - Identifier: ISSN: 2542-4653
CoNE: https://pure.mpg.de/cone/journals/resource/2542-4653