Hybridization of localized and density modes for the roton spectrum of superfluid ${^4}$He

Details Hybridization of localized and density modes for the roton spectrum of superfluid ${^4}$He Hybridization of localized and density modes for the roton spectrum of superfluid ${^4}$He

1998-05-28

arxiv.org/abs/cond-mat/9805372v3

Physics

Condensed Matter

Statistical Mechanics

4 pages, 3 figures

Scientific paper

A new description is presented for the roton part of the energy spectrum of supe rfluid ${^4}$He. It is based on the assumption that in addition to the Feynman density excitations, there exist localized modes which describe vortex-core elements. The energy spectrum which results from the hybridization of these two kinds of excitations is compared to the experimental data namely the structure factor and the scattering cross-section for the single quasiparticle excitation. Another type of excitation interpreted as a vortex loop is obtained whose energy agrees both with Raman scattering and critical velocity experiments.

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