Dynamic many-body theory: Dynamic structure factor of two-dimensional liquid $^4$He
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 plate...
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| Sprache: | eng |
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| Zusammenfassung: | 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. |
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| DOI: | 10.48550/arxiv.1406.2342 |