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Current issue   Ukr. J. Phys. 2014, Vol. 59, N 2, p.123-140


Tomchenko M.D.

Bogolyubov Institute for Theoretical Physics, Nat. Acad. of Sci. of Ukraine
(14b, Metrolohichna Str., Kyiv 03680, Ukraine; e-mail: mtomchenko@bitp.kiev.ua)

Microstructure of He II in the Presence of Boundaries

Section: Soft matter
Original Author's Text: English

Abstract: We have studied the microstructure of a system of interacting Bose particles under zero boundary conditions and have found two possible orderings. One ordering is traditional and is characterized by the Bogolyubov dispersion law E(k) at a weak interaction. The second one is new and is characterized by the same dispersion law, but with q = 2−d, where d is the number of noncyclic coordinates. At a weak interaction, the groundstate energy is less for the new solution. The boundaries affect the bulk microstructure due to the difference of the topologies of closed and open systems.

Key words: Bose particles, Bogolyubov dispersion law, Bose liquid, Bose gas.