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Roton-Phonon Interactions in Superfluid 4He
- Publication Year :
- 2012
-
Abstract
- High-resolution neutron resonance spin-echo measurements of superfluid 4He show that the roton energy does not have the same temperature dependence as the inverse lifetime. Diagrammatic analysis attributes this to the interaction of rotons with thermally excited phonons via both four- and three-particle processes, the latter being allowed by the broken gauge symmetry of the Bose condensate. The distinct temperature dependence of the roton energy at low temperatures suggests that the net roton-phonon interaction is repulsive.<br />5 pages, accepted version
- Subjects :
- Phonon
General Physics and Astronomy
Inverse
FOS: Physical sciences
Roton
01 natural sciences
7. Clean energy
010305 fluids & plasmas
Superfluidity
0103 physical sciences
010306 general physics
Condensed Matter - Statistical Mechanics
Gauge symmetry
Physics
Condensed Matter::Quantum Gases
Condensed matter physics
Statistical Mechanics (cond-mat.stat-mech)
Condensed Matter::Other
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
Condensed Matter - Other Condensed Matter
Quantum Gases (cond-mat.quant-gas)
Excited state
Condensed Matter - Quantum Gases
Energy (signal processing)
Superfluid helium-4
Other Condensed Matter (cond-mat.other)
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....d9e9847bffdf95fc771fb0a2f45e61d0