Non-equilibrium dynamics of an ultracold Bose gas under a multi-pulsed quantum quench in interaction

Abstract

We investigate the nonequilibrium dynamical properties of a weakly-interacting Bose gas at zero temperature under the multi-pulsed quantum quench in interaction by calculating one-body, two-body correlation functions and Tan's contact of the model system. The multi-pulsed quench is represented as follows: first suddenly quenching the interatomic interaction from $g_i$ to $g_f$ at time $t=0$, holding time $t$, and then suddenly quenching interaction from $g_f$ back to $g_i$, holding the time $t$ sequence $n$ times. In particular, two typical kinds of quenching parameters are chosen, corresponding to $(g_i/g_f>1)$ and $(g_i/g_f<1)$ respectively. We find that the more the quenching times of $n$ are, the more the excitations are excited, which suggests that the multi-pulsed QQ is more powerful way of studying the non-equilibrium dynamics of many-body quantum system than the `one-off' quantum quench. Finally, we discuss the ultra-short-range properties of the two-body correlation function after the $n$th quenching, which can be used to probe the `Tan'scontact' in experiments. All our calculations can be tested in current cold atom experiments.

7 pages, 4 figures

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Cited by in corpus (1)

• Quantum dynamical response of ultracold few boson ensembles in finite optical lattices to multiple interaction quenches