Dissipation engineered directional filter for quantum ratchets

Real- and Fourier-space observation of the anomalous $π$-mode in Floquet engineered plasmonic waveguide arrays

“…For specific frequencies, e.g., ω = 0.47J 0 , the widths of the bands collapse almost completely and we expect dynamic localization of wavepackets also in the bulk [17,28]. We note that this effect is not of topological nature but a consequence of the vanishing group velocity for these specific frequencies [17,26].…”

“…3(a)), the temporal evolution of the probability density is governed by ballistic spreading of the wave packet. The asymmetry with respect to the x-axis is a result of the initial condition that effectively breaks space and time inversion symmetries [26]. The corresponding momentum-resolved spectrum is composed of a set of Floquet bands with almost linear dispersion and band gaps at the Floquet Brillouin zone boundaries (see Fig.…”