Interplay between interaction and nonidentical coupling for a Bose–Einstein Condensate in a triple-well potential

•The interplay between interaction and nonidentical coupling gives rive to a “two negatives make a positive” effect.•In the weak interaction regime, the beating phenomenon is found.•In the strong interaction region, the collapse and revival sequences can appear instead of the beating sequences.

We investigate the effect of interaction and nonidentical coupling on the tunneling dynamics of a Bose–Einstein Condensate trapped in a triple-well potential. In certain parameter regions, we find a “two negatives make a positive” effect. While interaction or nonidentical coupling by itself can suppress the tunneling between the wells, both together enhance the tunneling. In addition, it is shown that under appropriate conditions, the mean-field dynamics displays beating phenomenon in the weak interaction regime. We present a physical explanation for such beating phenomenon. The effect of quantum fluctuation on the beating structure is also discussed numerically.