Superfluid solitons in 4He films

Biswas, A. C. ; Warke, C. S. (1983) Superfluid solitons in 4He films Physical Review B: Condensed Matter and Materials Physics, 28 (11). pp. 6539-6541. ISSN 1098-0121

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It is shown that in two-dimensional superfluid 4He films the one-dimensional solitons do not represent stable states in general. The system, however, admits of nonlinear excitations which are localized two-dimensional "lumps" consisting of superfluid condensate and which share many properties common with solitons. These objects should be experimentally observable in monolayer superfluid 4He films at very low temperature. For thick films where the finite thickness effect dominates over the surface term in the dispersion and changes its sign and solitons are stable with respect to transverse perturbations and may represent the dominant mode of nonlinear long-wave excitations.

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Source:Copyright of this article belongs to The American Physical Society.
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