Superfluid He 4 dynamics beyond quasiparticle excitations

K. Beauvois; C. E. Campbell; J. Dawidowski; B. Fåk; H. Godfrin; E. Krotscheck; H. J. Lauter; T. Lichtenegger; J. Ollivier; A. Sultan

doi:10.1103/PhysRevB.94.024504

Superfluid He 4 dynamics beyond quasiparticle excitations

K. Beauvois, C. E. Campbell, J. Dawidowski, B. Fåk, H. Godfrin, E. Krotscheck, H. J. Lauter, T. Lichtenegger, J. Ollivier, A. Sultan

Physics and Astronomy (Twin Cities)

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16 Scopus citations

Abstract

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.

Original language	English (US)
Article number	024504
Journal	Physical Review B
Volume	94
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevB.94.024504
State	Published - Jul 11 2016

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©2016 American Physical Society.

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abstract = "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.",

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AU - Beauvois, K.

AU - Campbell, C. E.

AU - Dawidowski, J.

AU - Fåk, B.

AU - Godfrin, H.

AU - Krotscheck, E.

AU - Lauter, H. J.

AU - Lichtenegger, T.

AU - Ollivier, J.

AU - Sultan, A.

PY - 2016/7/11

Y1 - 2016/7/11

N2 - 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.

AB - 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.

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Superfluid He 4 dynamics beyond quasiparticle excitations

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