Spectral statistics of driven Bose-Hubbard models

Jesús Mateos; Fernando Sols; Charles Creffield

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arXiv · 2306.09785

Spectral statistics of driven Bose-Hubbard models

Jesús Mateos·Fernando Sols·Charles Creffield

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Abstract

We study the spectral statistics of a one-dimensional Bose-Hubbard model subjected to kinetic driving; a form of Floquet engineering where the kinetic energy is periodically driven in time with a zero time-average. As the amplitude of the driving is increased, the ground state of the resulting flat-band system passes from the Mott insulator regime to an exotic superfluid. We show that this transition is associated with a change in the system's spectral statistics from Poisson to GOE-type. Remarkably, and unlike in the conventional Bose-Hubbard model, which we use as a benchmark, the details of the GOE statistics are sensitive to the parity of both the particle number and the lattice sites. We show how this effect arises from a hidden symmetry of the Hamiltonian produced by this form of Floquet driving.

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Jesús Mateos, Fernando Sols, Charles Creffield. 2023-06-16. Spectral statistics of driven Bose-Hubbard models. https://arxiv.org/abs/2306.09785

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