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arXiv · 2103.08941

Floquet engineering of Mott insulators with strong spin-orbit coupling

Naoya Arakawa·Kenji Yonemitsu
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Abstract

We propose a method for controlling the exchange interactions of Mott insulators with strong spin-orbit coupling. We consider a multiorbital system with strong spin-orbit coupling and a circularly polarized light field and derive its effective Hamiltonian in the strong-interaction limit. Applying this theory to a minimal model of $\alpha$-RuCl$_{3}$, we show that the magnitudes and signs of three exchange interactions, $J$, $K$, and $\Gamma$, can be changed simultaneously. Then, considering another case in which one of the hopping integrals has a different value and the other parameters are the same as those for $\alpha$-RuCl$_{3}$, we show that the Heisenberg interaction $J$ can be made much smaller than the anisotropic exchange interactions $K$ and $\Gamma$.

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Naoya Arakawa, Kenji Yonemitsu. 2021-03-16. Floquet engineering of Mott insulators with strong spin-orbit coupling. https://doi.org/10.1103/physrevb.103.l100408

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