Observation of Tkachenko Oscillations in Rapidly Rotating Bose-Einstein Condensates

I Coddington; P Engels; V Schweikhard; E. A Cornell

doi:10.1103/PhysRevLett.91.100402

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Observation of Tkachenko Oscillations in Rapidly Rotating Bose-Einstein Condensates

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Observation of Tkachenko Oscillations in Rapidly Rotating Bose-Einstein Condensates

I Coddington, P Engels, V Schweikhard and E. A Cornell

Physical review letters, Vol.91(10), pp.1004021-1004024

05/01/2003

DOI: https://doi.org/10.1103/PhysRevLett.91.100402

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https://hdl.handle.net/2376/105842

PMID: 14525467

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Abstract

Physics - Soft Condensed Matter

Phys.Rev.Lett.91:100402,2003 We directly image Tkachenko waves in a vortex lattice in a dilute-gas Bose-Einstein condensate. The low (sub-Hz) resonant frequencies are a consequence of the small but nonvanishing elastic shear modulus of the vortex-filled superfluid. The frequencies are measured for rotation rates as high as 98% of the centrifugal limit for the harmonically confined gas. Agreement with a hydrodynamic theory worsens with increasing rotation rate, perhaps due to the increasing fraction of the volume displaced by the vortex cores. We also observe two low-lying m=0 longitudinal modes at about 20 times higher frequency.

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Title: Observation of Tkachenko Oscillations in Rapidly Rotating Bose-Einstein Condensates
Creators: I Coddington
P Engels
V Schweikhard
E. A Cornell
Publication Details: Physical review letters, Vol.91(10), pp.1004021-1004024
Academic Unit: Physics and Astronomy, Department of
Identifiers: 99900546766901842
Language: English
Resource Type: Journal article