Non-equilibrium dynamics of quasi-one and two-dimensional Bose gases in an optical box

Atomic quantum gases confined in a box potential provide a versatile platform for studying non-equilibrium dynamics. In this poster, we explore different quench-induced dynamics under two scenarios, including the expansion dynamics in optical lattices and the correlation dynamics in attractively interacting gases. Firstly, expanding Bose gases are initiated in a 2D optical lattice by quenching the confining potential. We characterize the scaling behaviors behind the expansion dynamics under different conditions. In addition, we introduce density defects with controllable addressing potential and study the expansion behavior on top of a uniform background. Secondly, we examine the density and phase correlation dynamics in quasi-one-dimensional attractive Bose gases upon an interaction quench. Our experiment reveals an interplay between modulational instability seeded from bulk fluctuations and shockwaves emitted from an effective edge-induced dam-break. We also report on how long-range order can be reestablished following an interaction quench back to the repulsive.