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This paper obtains the energy-spectrum and eigenstate corrections of
two-mode Bose--Einstein condensates (BECs) coupled by quantum
tunnelling
by perturbation method in both strong and weak tunnelling
regions. The population imbalance between two BECs are then studied
in terms of the low-lying eigenstates which also characterize the
intrinsic entanglement between the two-mode BECs. The strong parity
effect in the weak tunnelling region is also investigated. 相似文献
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