Persistent current oscillations in a double-ring quantum gas

Abstract

Vorticity in closed quantum fluid circuits is known to arise in the form of persistent currents. In this work, we develop a method to engineer transport of the quantized vorticity between densitycoupled ring-shaped atomic Bose-Einstein condensates in experimentally accessible regimes. Introducing a tunable weak link between the rings, we observe and characterize the controllable periodic transfer of the current, and investigate the role of temperature on suppressing these oscillations via a range of complementary state-of-the-art numerical methods. Our set-up paves the way for precision measurements of local acceleration and rotation.