Minimally destructive, Doppler measurement of a quantized flow in a ring-shaped Bose-Einstein condensate

Year: 2016

Authors: Kumar A., Anderson N., Phillips WD., Eckel S., Campbell GK., Stringari S.

Autors Affiliation: NIST, Joint Quantum Inst, Gaithersburg, MD 20899 USA; Univ Maryland, Gaithersburg, MD 20899 USA;‎ Univ Trento, INO CNR BEC Ctr, I-38123 Povo, Italy; Univ Trento, Dipartimento Fis, I-38123 Povo, Italy

Abstract: The Doppler effect, the shift in the frequency of sound due to motion, is present in both classical gases and quantum superfluids. Here, we perform an in situ, minimally destructive measurement, of the persistent current in a ring-shaped, superfluid Bose-Einstein condensate using the Doppler effect. Phonon modes generated in this condensate have their frequencies Doppler shifted by a persistent current. This frequency shift will cause a standing-wave phonon mode to be ‘dragged’ along with the persistent current. By measuring this precession, one can extract the background flow velocity. This technique will find utility in experiments where the winding number is important, such as in emerging ‘atomtronic’ devices.


Volume: 18      Pages from: 025001-1  to: 025001-7

KeyWords: atomtronic devices; persistent currents; superfluidity
DOI: 10.1088/1367-2630/18/2/025001

Citations: 47
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