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Journal
2011 | 9 | 3 | 857-864
Article title

Short-wave excitations in non-local Gross-Pitaevskii model

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Abstracts
EN
We show that a non-local form of the Gross-Pitaevskii equation describes not only long-wave excitations, but also the short-wave ones in Bose-condensate systems. At certain parameter values, the excitation spectrum mimics the Landau spectrum of quasi-particle excitations in superfluid helium with roton minimum. The excitation wavelength, at which the roton minimum exists, is close to the inter-particle interaction range. We determine how the roton gap and the effective roton mass depend on the interaction potential parameters, and show that the existence domain of the spectrum with a roton minimum is reduced if one accounts for an inter-particle attraction.
Publisher
Journal
Year
Volume
9
Issue
3
Pages
857-864
Physical description
Dates
published
1 - 6 - 2011
online
26 - 2 - 2011
References
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Document Type
Publication order reference
YADDA identifier
bwmeta1.element.-psjd-doi-10_2478_s11534-010-0124-7
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