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Dynamical properties of a few ultra-cold fermions confined in a double-wellpotential is studied. We show that the dynamics, which is governed bysingle-particle tunnelings for vanishing interactions, is completely differentfor strong interactions. Depending on the details of the configuration, forsufficiently strong interactions (repulsions or attractions) the particle flowthrough the barrier can be accelerated or slowed down. This effect cannot beexplained with the single-particle picture. It is clarified with directinspection to the spectrum of the few-body Hamiltonian.

Diffusion in a system of a few distinguishable fermions in a one-dimensional double-well potential