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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 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.

preprint2014arXivOpen access
Eckhard KrotscheckThomas Lichtenegger
cond-mat.other
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Open access2 authors1 topic
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Eckhard KrotscheckThomas Lichtenegger

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