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Rapidly rotating Bose-Einstein condensates in anharmonic confinement

100%
Lu L.-H., Li Y.-Q.
Open Physics
|
2006
|
vol. 4
|
issue 3
299-309
EN
We study a rapidly rotating Bose-Einstein condensate in anharmonic confinement and find that many properties, such as the critical rotating frequency and phase diagram, are different from those in a harmonic trap. We investigate the phase transitions between various vortex lattices and find that a hole emerges in the center of the cloud when the rotating frequency Θ reaches Θh but it becomes invisible when Θ > 1.0842ω ⊥.
2
Content available remote

Manipulation of atom-to-molecule conversion in a magnetic lattice

81%
Hui N.-J., Lu L.-H., Fu L.-B., Li Y.-Q.
Open Physics
|
2013
|
vol. 11
|
issue 4
431-439
EN
Atom-to-molecule conversion by the technique of optical Feshbach resonance in a magnetic lattice is studied in the mean-field approximation. For the case of a shallow lattice, we give the dependence of the atomto-molecule conversion efficiency on tunnelling strength and atomic interaction by taking a double-well as an example. We find that one can obtain a high atom-to-molecule conversion by tuning the tunnelling and interaction strengths of the system. For the case of a deep lattice, we show that the existence of the lattice can improve the atom-to-molecule conversion for certain initial states.
3
Content available remote

The role of coherence on two-particle quantum walks

81%
Lu L.-H., Zhu S., Li Y.-Q.
Open Physics
|
2015
|
vol. 13
|
issue 1
EN
We investigate the dynamical properties of the two-boson quantum walk in systems with different degrees of coherence, and where the effect of the coherence on the two-boson quantum walk can be naturally introduced. A general analytical expression for the two-boson correlation function, for both pure states and mixed states, is given.We propose a possible two-photon quantum-walk scheme with a mixed initial state, and find that the twophoton correlation function and the average distance between two photons can be influenced by the initial photon distribution, the relative phase, or the degree of coherence. The propagation features of our numerical results can be explained by our analytical two-photon correlation function.
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