Volume 90, Number 4, May 2010
|Number of page(s)||5|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||04 June 2010|
Re-entrant transition of bosons in a quasiperiodic potential
Department of Physics, Umeå University - SE-90187 Umeå, Sweden, EU
Corresponding author: firstname.lastname@example.org
Accepted: 4 May 2010
We investigate the behavior of a two-dimensional array of Bose-Einstein condensate tubes described by means of a Bose-Hubbard Hamiltonian. Using a Wannier function expansion for the wave function in each tube, we compute the Bose-Hubbard parameters related to two different longitudinal potentials, periodic and quasiperiodic. We predict that —upon increasing the external potential strength along the direction of the tubes— the system can experience a re-entrant transition between a Mott insulating phase and the superfluid one.
PACS: 64.70.Tg – Quantum phase transitions / 03.75.Lm – Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices and topological excitations
© EPLA, 2010
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