Superposition is nothing more than addition for waves. Let’s say we have two sets of waves that overlap in space and time. At any given point, a trough may line up with a peak, their peaks may line up ...

Time mirrors are very cool. They seem a bit magical, undoing the damage that time has done, at least under the right circumstances. For light and for water waves, we know how to make a mirror that ...

(a) Proportion of excited modes (left) and the behavior with the evolution distance (right) when exciting the lattice from one corner. (b) Proportion of excited modes (left) and the behavior with the ...