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• W2214271611 abstract "We study nonequilibrium dynamics in the one-dimensional Bose-Hubbard model starting from an initial product state with one boson per site and a single-hole defect. We find that for parameters close to the quantum critical point, the hole splits into a core showing a very slow diffusive dynamics, and a fast mode which propagates ballistically. Using an effective fermionic model at large Hubbard interactions $U$, we show that the ballistic mode is a consequence of an interference between slow-holon and fast-doublon dynamics, which occurs once the hole defect starts propagating into the bosonic background at unit filling. Within this model, the signal velocity of the fast ballistic mode is given by the maximum slope of the dispersion of the doublon quasiparticle in good agreement with the numerical data. Furthermore, we contrast this global quench with the dynamics of a single-hole defect in the ground state of the Bose-Hubbard model and show that the dynamics in the latter case is very different even for large values of $U$. This can also be seen in the entanglement entropy of the time-evolved states which grows much more rapidly in time in the global quench case." @default.
• W2214271611 created "2016-06-24" @default.
• W2214271611 creator A5053354278 @default.
• W2214271611 creator A5063151404 @default.
• W2214271611 date "2015-06-18" @default.
• W2214271611 modified "2023-09-23" @default.
• W2214271611 title "Propagation of a single-hole defect in the one-dimensional Bose-Hubbard model" @default.
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• W2214271611 doi "https://doi.org/10.1103/physrevb.91.235132" @default.
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