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  • Letter

Inverse Faraday effect in Mott insulators

Saikat Banerjee1,*, Umesh Kumar1, and Shi-Zeng Lin2,†

  • 1Theoretical Division, T-4, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 2Theoretical Division, T-4 and CNLS, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

  • *saikatb@lanl.gov
  • †szl@lanl.gov
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Phys. Rev. B 105, L180414 – Published 31 May, 2022

DOI: https://doi.org/10.1103/PhysRevB.105.L180414

Abstract

The inverse Faraday effect (IFE), where a static magnetization is induced by circularly polarized light, offers a promising route to ultrafast control of spin states. Here we study the IFE in Mott insulators using the Floquet theory. We find two distinct IFE behavior governed by the inversion symmetry. In the Mott insulators with inversion symmetry, we find that the effective magnetic field induced by the IFE couples ferromagnetically to the neighboring spins. While for the Mott insulators without inversion symmetry, the effective magnetic field due to IFE couples antiferromagnetically to the neighboring spins. We apply the theory to the spin-orbit coupled single- and multiorbital Hubbard model that is relevant for the Kitaev quantum spin liquid material and demonstrate that the magnetic interactions can be tuned by light.

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Phys. Rev. B 105, L180414– Published 31 May, 2022
  • Received 4 September 2021
  • Revised 17 May 2022
  • Accepted 18 May 2022
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