title: Experimental observation of a superfluid gyroscope in a dilute Bose-Einstein condensate.
abstract: We have observed a three-dimensional gyroscopic effect associated with a vortex in a dilute Bose-Einstein condensed gas. A condensate with a vortex possesses a single quantum of circulation, and this causes the plane of oscillation of the scissors mode to precess around the vortex line. We have measured the precession rate of the scissors oscillation. From this we deduced the angular momentum associated with the vortex line and found a value close to Planck's over 2pi per particle, as predicted for a superfluid.
authors.affiliation: Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom.
authors.forename: E
authors.initials: E
authors.lastname: Hodby
authors.forename: S A
authors.initials: SA
authors.lastname: Hopkins
authors.forename: G
authors.initials: G
authors.lastname: Hechenblaikner
authors.forename: N L
authors.initials: NL
authors.lastname: Smith
authors.forename: C J
authors.initials: CJ
authors.lastname: Foot