Critical onset in coherent oscillations between two weakly coupled Bose-Einstein condensates

TL;DR

This paper investigates how initial acceleration and barrier velocity influence the critical onset of coherent oscillations and dc current lifetime in two weakly linked Bose-Einstein condensates, revealing key factors for experimental control.

Contribution

It provides a detailed analysis of the effects of initial acceleration and barrier velocity on Josephson dynamics in Bose-Einstein condensates, extending previous models.

Findings

dc current lifetime depends critically on barrier velocity

initial acceleration significantly affects Josephson effects

barrier velocity influences the stability of coherent oscillations

Abstract

The Josephson effects in two weakly linked Bose-Einstein condensates have been studied recently. In this letter, we study the equations derived by Giovanazzi et. al. [Phys. Rev. Lett. 84, 4521 (2000)] focusing on the effects of the initial acceleration and the velocity of the barrier on the ``dc'' current. We find that the dc current has lifetime which critically depends on the moving velocity of the barrier. Moreover, the influence of the initial acceleration is also investigated and found to be crucial for the experimental realization of the effects.