Fig. 2: Temporal interference of degenerate state.

a Lattice structures at different time intervals and changes of the band structure and states at different TIs, accordingly. Green (yellow) dots denote the states before (after) the TI. Blue arrows denote the change at the TI. b Evolution of the intensity distributions of the wave packet in the proposed temporal multilayer structure. The additional phase θ is taken as θ = 0.5π. c, d Evolutions of the intensity distribution only for odd number sites and even number sites, respectively. Arb. Units arbitrary units.