Solitary-wave propagation in superfluid sup 4 He films
Journal Article
·
· Physical Review, B: Condensed Matter; (USA)
- The Institute of Mathematical Sciences, Madras (India)
It is shown that in superfluid {sup 4}He films, finite-amplitude localized density fluctuations can propagate as pulse-type solitary waves. These excitations are obtained by solving the nonlinear evolution equation for the superfluid order parameter associated with a microscopic pseudospin model of hard-core bosons with nearest-neighbor interactions. For a given film thickness both hot'' and cold'' solitary waves are possible, depending on the initial disturbance. The solitary-wave velocity is always less than that of the linear third-sound mode in the system. The width and amplitude of the solitary wave are determined as functions of its velocity and the microscopic parameters of the model.
- OSTI ID:
- 6397333
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 42:10; ISSN 0163-1829; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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