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Resistive Flow in a Weakly Interacting Bose-Einstein condensate



Fred Jendrzejewski, Stephen P. Eckel, Noel Murray, Calib Lanier, Mark Edwards, Christopher J. Lobb, Gretchen K. Campbell


We report the direct observation of resistive flow through a weak link in a weakly interacting atomic Bose- Einstein condensate (BEC). Two weak links separate our ring-shaped superfluid atomtronic circuit into two distinct regions, a source and a drain. Motion of these weak links allows for creation of controlled flow between the source and the drain. At a critical value of the weak link velocity, we observe a transition from superfluid flow to superfluid plus resistive flow. Working in the hydrodynamic limit, we observe a conductivity that is four orders of magnitude larger than previously reported conductivities for a BEC with a tunnel junction. Good agreement with zero-temperature Gross-Pitaevskii simulations and a phenomenological model based on phase slips indicate that the observed conductivity can be described by the creation of excitations. Our measurements of resistive flow elucidate the microscopic origin of the dissipation and pave the way for more complex atomtronic devices.
Physical Review Letters


atomic circuits, Bose-Einstein condensation, superfluidity, transport, ultracold atoms


Jendrzejewski, F. , Eckel, S. , Murray, N. , Lanier, C. , Edwards, M. , Lobb, C. and Campbell, G. (2014), Resistive Flow in a Weakly Interacting Bose-Einstein condensate, Physical Review Letters, [online], (Accessed April 16, 2024)
Created July 25, 2014, Updated November 10, 2018