2014/06/09 by E. Krotscheck, Eckhard Krotscheck, T. Lichtenegger +1 · 6 citations
Mathematics · Physics and Astronomy · #Atomic and Subatomic Physics Research #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Dynamic structure factor #Excitation #Function (biology) #Helium #Helium-4 #Inelastic scattering #Mathematics #Particle (ecology) #Phase transition #Phonon #Physics #Plateau (mathematics) #Quantum mechanics #Quantum, superfluid, helium dynamics #Roton #Scattering #Statistical physics #Structure factor #Superfluid helium-4 #Superfluidity #cond-mat.other
paper · pdf · doi:10.1007/s10909-014-1221-6
published in Journal of Low Temperature Physics 178(1-2), 61-77 (Springer Science+Business Media) · 11 pages
arxiv created 2014/06/09 · openalex publication_date 2014/09/08 · arxiv updated 2015/06/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We calculate the dynamic structure function of two-dimensional liquid 4He at zero temperature employing a quantitative multi-particle fluctuations approach up to infinite order. We observe a behavior that is qualitatively similar to the phonon-maxon-roton-curve in 3D, including a Pitaevskii plateau (L. P. Pitaevskii, Sov. Phys. JETP 9, 830 (1959)). Slightly below the liquid-solid phase transition, a second weak roton-like excitation evolves below the plateau.