Probing and controlling spin chirality in Mott insulators by circularly polarized laser

Abstract

Scalar spin chirality, a three-body spin correlation that breaks time-reversal symmetry, is revealed to couple directly to circularly polarized laser. This is shown by the Floquet formalism for the periodically driven repulsive Hubbard model with a strong-coupling expansion. A systematic derivation of the effective low-energy Hamiltonian for a spin degree of freedom reveals that the coupling constant for scalar spin chirality can become significant for a situation in which the driving frequency and the on-site interaction are comparable. This implies that the scalar chirality can be induced by circularly polarized lights, or that it can be used conversely for probing the chirality in Mott insulators as a circular dichroism.

10 pages, 8 figures

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• Photo-induced nonequilibrium states in Mott insulators
• The antiferromagnetic phase of the Floquet-driven Hubbard model
• Floquet engineering correlated materials with unpolarized light
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• Light-induced topological magnons in two-dimensional van der Waals magnets
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• Photocontrol of magnetic structure in an itinerant magnet
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• Optical control of competing exchange interactions and coherent spin-charge coupling in two-orbital Mott insulators
• Chiral Y junction of quantum spin chains
• Symmetry analysis of light-induced magnetic interactions via Floquet engineering
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• Effects of topological and non-topological edge states on information propagation and scrambling in a Floquet spin chain
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• Twisted light-induced spin-spin interaction in a chiral helimagnet
• Scalar spin chirality induced by a circularly polarized electric field in a classical kagome magnet
• Generation of dc, ac, and second-harmonic spin currents by electromagnetic fields in an inversion-asymmetric antiferromagnet
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• Many-body Keldysh Crossover in the DC-driven Haldane Spin Chain