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Article Dans Une Revue Physical Review B Année : 2016

Superfluid 4He dynamics beyond quasiparticle excitations

Résumé

The dynamics of superfluid He4 at and above the Landau quasiparticle regime is investigated by high-precision inelastic neutron scattering measurements of the dynamic structure factor. A highly structured response is observed above the familiar phonon-maxon-roton spectrum, characterized by sharp thresholds for phonon-phonon, maxon-roton, and roton-roton coupling processes. The experimental dynamic structure factor is compared to the calculation of the same physical quantity by a dynamic many-body theory including three-phonon processes self-consistently. The theory is found to provide a quantitative description of the dynamics of the correlated bosons for energies up to about three times that of the Landau quasiparticles.

Dates et versions

hal-01361110 , version 1 (06-09-2016)

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K. Beauvois, C. E. Campbell, J. Dawidowski, B. Fåk, Henri Godfrin, et al.. Superfluid 4He dynamics beyond quasiparticle excitations. Physical Review B, 2016, 94 (2), pp.024504. ⟨10.1103/PhysRevB.94.024504⟩. ⟨hal-01361110⟩
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