4.8 Article

Resistive Flow in a Weakly Interacting Bose-Einstein Condensate

Journal

PHYSICAL REVIEW LETTERS
Volume 113, Issue 4, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.045305

Keywords

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Funding

  1. ONR
  2. ARO atomtronics MURI
  3. NSF through the PFC@JQI [PHY-0822671, PHY-1068761]
  4. National Research Council
  5. Division Of Physics
  6. Direct For Mathematical & Physical Scien [1068761] Funding Source: National Science Foundation
  7. Division Of Physics
  8. Direct For Mathematical & Physical Scien [1430094] Funding Source: National Science Foundation

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We report the direct observation of resistive flow through a weak link in a weakly interacting atomic Bose-Einstein condensate. 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 4 orders of magnitude larger than previously reported conductivities for a Bose-Einstein condensate with a tunnel junction. Good agreement with zero-temperature Gross-Pitaevskii simulations and a phenomenological model based on phase slips indicate that the creation of excitations plays an important role in the resulting conductivity. Our measurements of resistive flow elucidate the microscopic origin of the dissipation and pave the way for more complex atomtronic devices.

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