Europhys. Lett.
Volume 76, Number 2, October 2006
Page(s) 215 - 221
Section General
Published online 20 September 2006
Europhys. Lett., 76 (2), pp. 215-221 (2006)
DOI: 10.1209/epl/i2006-10264-8

Superfluidity in a gas of strongly interacting bosons

G. M. Kavoulakis, Y. Yu, M. Ögren and S. M. Reimann

Mathematical Physics, LTH, Lund University - P.O. Box 118, S-22100 Lund, Sweden

received 2 July 2006; accepted in final form 29 August 2006
published online 20 September 2006

We consider small systems of bosonic atoms rotating in a toroidal trap. Using the method of exact numerical diagonalization of the many-body Hamiltonian, we examine the transition from the Bose-Einstein condensed state to the Tonks-Girardeau state. The system supports persistent currents in a wide range between the two limits, even in the absence of Bose-Einstein condensation.

05.30.Jp - Boson systems.
03.75.Lm - Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations.
67.40.-w - Boson degeneracy and superfluidity of 4He.

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