Floquet spin and spin-orbital Hamiltonians and doublon-holon generations in periodically driven Mott insulators

TL;DR

This paper derives effective Floquet spin and spin-orbital Hamiltonians for periodically driven Mott insulators, demonstrating tunability via laser parameters and analyzing heating and dielectric breakdown effects.

Contribution

It provides a comprehensive derivation of Floquet Hamiltonians for both single and multi-orbital Mott insulators under periodic driving, including effects of finite bandwidth and low-frequency regimes.

Findings

Exchange interactions are highly tunable by laser parameters.

Finite bandwidth effects influence heating and excitation dynamics.

The formalism extends to studying dielectric breakdown at low frequencies.

Abstract

We consider Mott insulators driven by periodic coherent laser radiation, using both single orbital and multi-orbital models, noting that the latter is of more interest in solid state systems. We derive general expressions for the resulting periodically driven spin models and spin-orbital models using time-dependent perturbation theory. First, we show that the effective exchange interactions of the Floquet Hamiltonians are highly tunable by the frequency, amplitude, and polarization of the laser. Second, we take the effect of finite bandwidth of excitations into account and study possible heating effects. Using the same formalism with a slight modification we also consider the small frequency regime and study the dielectric breakdown of Mott insulators.