Dynamics of rotons

It is shown that point dipoles in a superfluid obeying the Landau dispersion relation for rotons can form stable bound states. Structure is added to the roton model by adding the octupole moment appropriate to a vortex ring. The binding energy is then computed to be 0.337°K. Scattering appears to be...

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Bibliographic Details
Published in:Physics letters. A 1973-01, Vol.43 (1), p.1-2
Main Authors: Roberts, P.H., Donnelly, R.J.
Format: Article
Language:English
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Summary:It is shown that point dipoles in a superfluid obeying the Landau dispersion relation for rotons can form stable bound states. Structure is added to the roton model by adding the octupole moment appropriate to a vortex ring. The binding energy is then computed to be 0.337°K. Scattering appears to be satisfactorily accounted for by the dipole approximation.
ISSN:0375-9601
1873-2429
DOI:10.1016/0375-9601(73)90516-1