Title
Roton excitations in Bose-Einstein condensates and a fluid-solid transition Roton excitations in Bose-Einstein condensates and a fluid-solid transition
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
London ,
Subject
Physics
Chemistry
Source (journal)
Physics and chemistry of liquids. - London
Volume/pages
43(2005) :5 , p. 423-427
ISSN
0031-9104
ISI
000232966200002
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Several authors have recently discussed the existence of roton excitations in Bose - Einstein condensates (BECs) and considered how a roton dip in the dispersion curve of elementary excitations may be related to the formation of a spatially modulated ground state. Here attention is drawn to a theoretical study of Minguzzi et al. on interatomic correlations in a BEC from dipole - dipole interactions induced by laser light of increasing intensity. Attractive interactions in superfluid He-4 and repulsive interactions in 'untuned' BECs are then compared and contrasted, the experiments of Woods and Cowley and of Greiner et al. providing the focus respectively. It is stressed that, contrary to a very recent assertion by Nazario and Santiago, 4 He is crucially different from BECs at the lowest temperatures.
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