Dispersion relation of Landau elementary excitations and thermodynamic properties of superfluid <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>He</mml:mi><mml:mprescripts/><mml:none/><mml:mn>4</mml:mn></mml:mmultiscripts></mml:math>
H. Godfrin, K. Beauvois, A. Sultan, E. Krotscheck, J. Dawidowski, B. Fåk, Jacques Ollivier
Abstract
Superfluid ${}^{4}$He, a strongly correlated Bose-Einstein condensed many-body system, displays sharp phonon-roton quantized excitations. Here, the authors report a complete determination of the dispersion relation of these excitations, using the most advanced inelastic neutron scattering methods as well as detailed dynamic many-body theory calculations. From the measured dispersion, the authors obtain, analytically as well as numerically, accurate tables of the thermodynamic properties. These highly precise results provide indispensable reference for a large variety of fundamental experimental and theoretical studies.
Topics & Concepts
Dispersion relationRotonSuperfluidityPhysicsDispersion (optics)PhononHelium-3Relation (database)Condensed matter physicsStatistical physicsQuantum mechanicsSuperfluid helium-4Computer scienceDatabaseQuantum, superfluid, helium dynamicsAtomic and Subatomic Physics ResearchCold Atom Physics and Bose-Einstein Condensates