Predicted signatures of rotating Bose-Einstein condensates
Article Abstract:
The steady states of a confined, rotating dilute Bose gas can be predicted through calculations of the macroscopically occupied condensate wave function Psi. Calculations of low energy states of a rotating, weakly interacting Bose gas are reported, and transitions between stable vortex patterns with different symmetries were found. This finds general qualitative agreement with observations of the strong-coupling rotating super-fluid helium.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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Condensates in a twist
Article Abstract:
Most materials freeze solid at temperatures close to absolute zero, with flow becoming impossible. Bose-Einstein condensates are quantum fluids, and according to quantum mechanics, the flow of a Bose-Einstein condensate is ruled by variations in the condensate wave-function's phase. The condensate phase is uniform at rest, and all phases must occur at least once to introduce flow.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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Condensate forced out of hiding
Article Abstract:
It is accepted that a Bose-Einstein condensate is responsible for the phase transition of liquid He below a temperature of 2.17 K, to a new state of matter with superfluid properties. Wyatt has reported a macroscopic fraction of atoms with zero momentum in liquid. Atoms were knocked from the free surface of superfluid He, using high-energy phonons, generated in the bulk liquid.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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