Talk given by

Dr. Chen-Yen Lai

Department of Physics

University of Califonia at Merced

USA

Abstract:

In electronic systems, batteries provide charge source and sink, but the atomic analogues of driving neutral atoms still remain a challenge task.

Here, we address an issue of using dynamically emerged local potentials as a local controllable particle source and sink. A deep potential can collect many bosons in single site as a faithful sink in equilibrium, which indicates the usefulness in adiabatic limit. The sudden switching of local potential, however, exhibits low efficiency of attracting bosons into it, and this is because energy conservation in the isolated systems, such as cold atoms.

An averse response is observed where a deeper quenched potential results in less bosons in the sink by varying the potential depth and background interaction strength. In order to improve the effectiveness, we consider external reservoir, and the system-reservoir couplings extend the theoretical description to open quantum systems. Several different types of coupling are considered on top of dynamically emerged sink, and a Lindblad operator corresponding to local cooling processes can significantly improve the effectiveness of the dynamical emerged sink.