Two types of quasiparticles excited in a Bose gas

We present a novel approach for investigating the superfluid liquid 4He based on the proper use of the nonideal Bose gas model for dilute hard spheres. The results show that the presence of a macroscopic number of condensate atoms leads to the existence of a nonphysical branch, corresponding to dens...

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Veröffentlicht in:Physical review letters 2003-06, Vol.90 (23), p.235301-235301, Article 235301
Hauptverfasser: Minasyan, V N, Touryan, K J
Format: Artikel
Sprache:eng
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Zusammenfassung:We present a novel approach for investigating the superfluid liquid 4He based on the proper use of the nonideal Bose gas model for dilute hard spheres. The results show that the presence of a macroscopic number of condensate atoms leads to the existence of a nonphysical branch, corresponding to density excitations, in addition to the continuous branch of the phonon-maxon-roton excitation spectrum.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.90.235301