Nonequilibrium dynamics of ultracold bosons in an optical quasicrystal

In this talk, I will discuss the dynamics of ultracold bosons after quenches across the Bose glass transition in an optical quasicrystal. We observe two distinct oscillatory behaviors depending on the direction of the quench: for the quench from the superfluid to Bose glass regime, the dynamics mainly depend on the disorder strength, whereas they are dominated by the tunneling rate for the reverse quench. Moreover, we investigate the coherence of the system following a fast sweep from an initial superfluid to different final lattice depths and experimentally monitor the change of the matter-wave interference. The Bose glass transition is also reflected by how fast the system loses coherence after the sweep, in good agreement with both the phase coherence measurement and theoretical simulation. Our findings using quasicrystals pave the way for exploring many-body localization and thermalization in (quasi-)disordered materials.