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  • Title: Floquet Engineering of Multiorbital Mott Insulators: Applications to Orthorhombic Titanates.
    Author: Liu J, Hejazi K, Balents L.
    Journal: Phys Rev Lett; 2018 Sep 07; 121(10):107201. PubMed ID: 30240238.
    Abstract:
    We consider driving multiorbital Mott insulators using laser radiation. We derive general expressions for periodically driven spin-orbital models using time-dependent perturbation theory in the strong interaction limit. We show that the effective exchange interactions of the Floquet spin-orbital Hamiltonian are highly tunable via variations of the frequency, amplitude, and polarization of the laser. We also take the effect of a finite bandwidth of excitations into account and study possible heating effects. We further apply our formalism to orthorhombic titanates YTiO_{3} and LaTiO_{3} based on first-principles calculations, and we find that the spin exchange interactions in these compounds can be engineered to a large extent by tuning the frequency and electric-field amplitude of the laser.
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