Volume 104, Number 6, December 2013
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||21 January 2014|
Role of asymmetry in the geometric phase of a coupled atom-heteronuclear molecule system
1 School of Science, Xi'an Jiaotong University - Xi'an 710049, PRC
2 Department of Physics, Northwest University - Xi'an 710069, PRC
Received: 14 November 2013
Accepted: 16 December 2013
We investigate the role of asymmetry in the geometric phase of an ultracold bosonic atom-heteronuclear molecule system where the asymmetry denotes the particle-number imbalance between two atomic species. Based on the mean-field approach, we derive the analytical expression of the geometric phase and confirm it by our numerical simulations. It is found that the geometric phase strongly depends both on the atom-number imbalance and the nonlinear particle interaction. We show that the geometric phase can be dramatically enhanced by increasing the imbalance or the repulsive interaction strength. For the symmetric case, a discontinuous behavior for the first-order derivative of the ground-state geometric phase at a critical point is seen which gives a distinct signal of a phase transition from mixed atom-molecule phase to pure molecule phase. The virtual magnetic field interpretation for the geometric phase is also given.
PACS: 67.10.Ba – Boson degeneracy / 03.65.Vf – Phases: geometric; dynamic or topological / 05.30.Rt – Quantum phase transitions
© EPLA, 2013
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.