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The peaked structure of phonon density of states of a confined superfluid - a theoretical prediction, and discussions regarding its experimental probe
Univ Uppsala, Dept Phys, Condensed Matter Theory Grp, S-75121 Uppsala, Sweden Linkoping Univ, Dept Phys, Theoret Phys Grp, S-58183 Linkoping, Sweden.
2000 (English)In: Journal de Physique IV: Colloque, ISSN 1155-4339, Vol. 10, no P7, 181-184 p.Article in journal (Refereed) Published
Abstract [en]

We report on an exact, first principles result which shows that when the superfluid of He-4 is spatially confined, gaps are created in the phonon excitation energy and that the phonon density of states (PDOS) presents sharp peaks positioned at the gap edges. This finding complements our knowledge of the physics occurring in a spatially confined quantum system, for the superfluid of He-4 in particular, this has been shown to result in the critical velocity of a flow motion. Here, we first derive an exact expression of the PDOS of a confined superfluid, and then discuss related aspects regarding the probing of the detailed structure of the peaked PDOS using inelastic neutron scattering.

Place, publisher, year, edition, pages
2000. Vol. 10, no P7, 181-184 p.
National Category
Natural Sciences
URN: urn:nbn:se:liu:diva-49671OAI: diva2:270567
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2011-01-14

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