Sketch of the Experimental Set-Up (IMAGE) ETH Zurich Department of Physics Caption The lattice potential consists of individual dimers. The lattice position is sinusoidally modulated in one direction at two frequencies (purple and orange arrows). Depending in the occupancy in the lattice, atoms can pick up a phase (green arrows) in a density-assisted tunnelling process (brown arrow), compared to a single-particle hopping process (blue arrow). Credit Figure adapted from Görg et al., doi: 10.1038/s41567-019-0615-4, Nat. Phys. (2019). Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.