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Superfluidity from correlations in driven boson systems

Jes\'us MateosCharles CreffieldFernando Sols
Dec 2022
摘要
We investigate theoretically the superfluidity of a one-dimensional bosonsystem whose hopping energy is periodically modulated with a zero time average,which results in the suppression of first-order single-particle hoppingprocesses. The dynamics of this flat band system is entirely driven bycorrelations and described by exotic Hamiltonian and current operators. Weemploy exact diagonalization and compare our results with those of theconventional, undriven Bose-Hubbard system. We focus on the two mainmanifestations of superfluidity, the Hess-Fairbank effect and the metastabilityof supercurrents, with explicit inclusion of an impurity when relevant. Amongthe novel superfluid features, we highlight the presence of a cat-like groundstate, with branches that have opposite crystal momentum but carry the sameflux-dependent current, and the essential role of the interference between thecollective components of the ground-state wave function. Calculation of thedynamic form factor reveals the presence of an acoustic mode that guaranteessuperfluidity in the thermodynamic limit.
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