Non-equilibrium dynamics of an ultracold Bose gas under multi-pulsed interaction quenches

摘要

We investigate the non-equilibrium properties of a weakly interacting Bose gas subjected to a multi-pulsed quench at zero temperature, where the interaction parameter in the Hamiltonian system switches between values g(i) and g(f) for multiple times. The one body and two-body correlation functions as well as Tan's contact are calculated. The quench induced excitations are shown to increase with the number of quenches for both g(i)/g(f) > 1 and g(i)/g(f) < 1. This implies the possibility to use multi-pulsed quantum quench as a more powerful way as compared to the "one-off" quench in controllable explorations of non-equilibrium quantum many-body systems. In addition, we study the ultra-short-range property of the two-body correlation function after multiple interaction quenches, which can serve as a probe of the "Tan's contact" in the experiments. Our findings allow for an experimental probe using state of the art techniques with ultracold quantum gases.