Volume 79, Number 1, July 2007
Article Number 10001
Number of page(s) 5
Section General
Published online 06 June 2007
EPL, 79 (2007) 10001
DOI: 10.1209/0295-5075/79/10001

Controllable quantum phase transition in two-component Bose-Einstein condensates under periodic modulation

G. Chen1, 2, J.-Q. Liang2 and Z. D. Chen1

1  Department of Physics, Shaoxing College of Arts and Sciences - Shaoxing 312000, PRC
2  Institute of Theoretical Physics, Shanxi University - Taiyuan 030006, PRC

received 12 March 2007; accepted in final form 16 May 2007; published July 2007
published online 6 June 2007

In this letter we predict a novel second-order quantum phase transition of two-component Bose-Einstein condensates coupled with a periodically driven laser field in the resonant case. It is shown that this quantum phase transition from the normal to the tunneling phases can be controlled by the interspecies nonlinear interaction tuned via the magnetic-field$\hbox{--} $dependent Feshbach resonance technique. Furthermore, it is also demonstrated that this quantum phase transition can be detected by measuring the ground-state population imbalance between two condensates.

03.75.Kk - Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow.

© Europhysics Letters Association 2007