Flux enhanced localization and reentrant delocalization in the quench dynamics of two interacting bosons on a Bose-Hubbard ladder
arXiv:2311.14117 · doi:10.1103/PhysRevA.109.043308
Abstract
We study the quench dynamics of two bosons possessing onsite repulsive interaction on a two-leg ladder and show that the presence of uniform flux piercing through the plaquettes of the ladder favors the localization of the bound states in the dynamics. We find that when the two bosons are symmetrically initialized on the edge rung of the ladder, they tend to edge-localize in their quantum walk - a phenomenon which is not possible in the absence of flux. On the other hand, when the bosons are initialized on the bulk rung they never localize and exhibit linear spreading in their quantum walk. Interestingly, however, we find that in the later case a finite flux favours localization of the bulk bound states in the presence of sufficiently weak quasiperiodic disorder which is otherwise insufficient to localize the particles in the absence of flux. In both the cases, we obtain that the localization in the dynamics strongly depends on the combined effect of the flux and interaction strengths, as a result which we obtain a signature of re-entrant delocalization as a function of flux (interaction) for fixed interaction (flux) strengths.
8 pages, 15 figures
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