Persistent current oscillations in a double-ring quantum gas

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 density-coupled 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 setup paves the way for precision measurements of local acceleration and rotation.

Automated summary

In this work, a method to engineer transport of quantized vorticity in closed quantum fluid circuits is developed. The controllable periodic transfer of current is observed and characterized by introducing a tunable weak link between ring-shaped atomic Bose-Einstein condensates. The role of temperature on suppressing these oscillations is investigated using complementary state-of-the-art numerical methods.