Dynamic many-body theory: Dynamic structure factor of two-dimensional liquid ${}^4$He

Abstract

We calculate the dynamic structure function of two-dimensional liquid ${}^4$He 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.

arXiv comment11 pages

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• Ab-initio low-energy dynamics of superfluid and solid 4He
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• Dynamic structure factor for 3He in two-dimensions
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Cited by in corpus (3)

• Possible quantum liquid crystal phases of helium monolayers
• Surface-dominated finite size effects in nanoconfined superfluid helium
• Variational and parquet-diagram calculations for neutron matter. IV. Spin-orbit interactions and linear response