Enhancement of chaotic subdiffusion in disordered ladders with synthetic gauge fields

Abstract

We study spreading wave packets in a disordered nonlinear ladder with broken time-reversal symmetry induced by synthetic gauge fields. The model describes the dynamics of interacting bosons in a disordered and driven optical ladder within a mean-field approximation. The second moment of the wave packet $m_2=g{t}^{\alpha }$ grows subdiffusively with the universal exponent $\alpha \simeq 1/3$ similar to the time-reversal case. However the prefactor $g$ is strongly modified by the field strength and shows a non-monotonic dependence. For a weak field, the prefactor increases since time-reversal enhanced backscattering is suppressed. For strong fields the spectrum of the linear wave equation reduces the localization length through the formation of gaps and narrow bands. Consequently the prefactor for the subdiffusive spreading law is suppressed.

arXiv comment7 pages, 12 figures, Figs. 6, 7 and 8 added, references added, typos corrected

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• Bose-Hubbard ladder subject to effective magnetic field: quench dynamics in a harmonic trap
• Nonlinear Lattice Waves in Random Potentials
• Interaction-induced connectivity of disordered two-particle states
• Wave propagation in a strongly disordered 1D phononic lattice supporting rotational waves
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• Wave-packet spreading in disordered soft architected structures
• Equilibrium and Non-equilibrium Gross-Pitaevskii Lattice Dynamics: Interactions, Disorder, and Thermalization