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Bloch oscillations are a striking feature of the counterintuitive motion of particles created by a lattice potential [1]. However, this phenomenon does not require the presence of a lattice, nor is it limited to single-particle physics. One can reproduce such an effect with a system, possibly many-body, that is translationally invariant, provided that the dispersion relation remains periodic [2].
A notable example of this phenomenon is magnetic solitons, which can be mapped onto an immiscible spin mixture in a quasi-1D Bose gas. We report on the observation of such Bloch-like oscillations, which prove to be analogous to Josephson physics [3]. Our experimental investigation encompasses both strict and periodic boundary conditions, the latter of which highlights the importance of the phase coherence of the quantum bath and the associated topology.
[1] F. Bloch, Z. Phys. 52, 555 (1929).
[2] D.M. Gangardt and A. Kamenev, Phys. Rev. Lett. 102, 070402 (2009).
[3] S. Bresolin, A. Roy, G. Ferrari, A. Recati, and N. Pavloff, Phys. Rev. Lett. 130, 220403 (2023).
