dc.contributor.author |
Kruglov, Vladimir |
en |
dc.contributor.author |
Collett, Matthew |
en |
dc.date.accessioned |
2012-03-30T00:17:43Z |
en |
dc.date.issued |
2008 |
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dc.identifier.citation |
Journal of Physics B: Atomic, Molecular and Optical Physics 41(3) 2008 |
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dc.identifier.issn |
0953-4075 |
en |
dc.identifier.uri |
http://hdl.handle.net/2292/16151 |
en |
dc.description.abstract |
We have proposed a model of roton cluster excitations in liquid 4 He based on a Schrodinger-type equation with a self-consistent confining potential. We have derived an ¨ equation for the number of atoms in the roton cluster, which can be treated as quantum 3D solitons depending on vibrational quantum numbers. It is shown that the smallest roton cluster is in the symmetric vibrational quantum state and consists of 13 helium atoms. We have also used a modified Born approximation to calculate the s-scattering length for helium atoms. This allows us to calculate all parameters of Landau’s roton excitation spectrum, in agreement to high accuracy with experimental measurements from neutron scattering. It is also shown that the model leads to the saturation of the elementary excitation energy curve at twice the roton gap. |
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dc.publisher |
IOP Publishing |
en |
dc.relation.ispartofseries |
Journal of Physics B - Atomic Molecular and Optical Physics |
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dc.rights |
Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher.
Details obtained from http://www.sherpa.ac.uk/romeo/issn/0953-4075/ |
en |
dc.rights.uri |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
en |
dc.title |
Cluster model of roton excitations in liquid 4He |
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dc.type |
Journal Article |
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dc.identifier.doi |
10.1088/0953-4075/41/3/035305 |
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pubs.begin-page |
1 |
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pubs.volume |
41 |
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dc.rights.holder |
Copyright: IOP Publishing |
en |
pubs.end-page |
13 |
en |
dc.rights.accessrights |
http://purl.org/eprint/accessRights/RestrictedAccess |
en |
pubs.subtype |
Article |
en |
pubs.elements-id |
64315 |
en |
pubs.org-id |
Science |
en |
pubs.org-id |
Physics |
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pubs.number |
035305 |
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pubs.record-created-at-source-date |
2010-09-01 |
en |