2D Bose glass in an optical quasicrystal

An optical quasicrystal opens novel opportunities for studying (quasi-)disorder-driven phenomena. In the presence of both interactions and disorder, a Bose glass phase emerges. Here we report on the direct observation of a 2D Bose glass phase in an optical quasicrystal and present studies of both its static and dynamical features. By probing the phase coherence of the system, we observe a superfluid to Bose glass phase transition. Furthermore, we reveal the nonergodic nature of the Bose glass using a coherence restoration sequence. Finally, we investigate dynamical features following a quench between the superfluid and Bose glass regime. Our observations unveil the Bose glass transition in optical quasicrystals and open a new door for studying many-body localization in two dimensions.