Many-body quantum chaos in mixtures of multiple species

Abstract

We study spectral correlations in many-body quantum mixtures of fermions, bosons, and qubits with periodically kicked spreading and mixing of species. We take two types of mixing, namely, Jaynes-Cummings and Rabi, respectively, satisfying and breaking the conservation of a total number of species. We analytically derive the generating Hamiltonians whose spectral properties determine the spectral form factor in the leading order. We further analyze the system-size $(L)$ scaling of Thouless time $t^{\ast }$, beyond which the spectral form factor follows the prediction of random matrix theory. The $L$-dependence of $t^{\ast }$ crosses over from $\log L$ to $L^2$ with an increasing Jaynes-Cummings mixing between qubits and fermions or bosons in a finite-sized chain, and it finally settles to $t^{\ast }\propto \mathcal{O}(L^2)$ in the thermodynamic limit for any mixing strength. The Rabi mixing between qubits and fermions leads to $t^{\ast }\propto \mathcal{O}(\log L)$, previously predicted for single species of qubits or fermions without total number conservation.

arXiv comment15 pages, 8 figures

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