Effective Bose-Hubbard interaction with enhanced nonlinearity in an array of coupled cavities

Effective Bose-Hubbard interaction with enhanced nonlinearity in an array of coupled cavities

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摘要 An array of coupled cavities, each of which contains an N four-level atom, is investigated. When cavity fields dispersively interact with the atoms, an effective Bose-Hubbard model can be achieved. By numerically comparing the full Hamiltonian with the effective one, we find that within the parameters region, the effective Hamiltonian can completely account for the Mort-insulator as well as the phase transition from the similar Mort-insulator to superfluid. Through jointly adjusting the classical Rabi frequency and the detuning, the nonlinearity can be improved. An array of coupled cavities, each of which contains an N four-level atom, is investigated. When cavity fields dispersively interact with the atoms, an effective Bose-Hubbard model can be achieved. By numerically comparing the full Hamiltonian with the effective one, we find that within the parameters region, the effective Hamiltonian can completely account for the Mort-insulator as well as the phase transition from the similar Mort-insulator to superfluid. Through jointly adjusting the classical Rabi frequency and the detuning, the nonlinearity can be improved.

作者周玲刘忠菊闫伟斌穆青霞

机构地区 School of Physics and Optoelectronics Engineering

出处《Chinese Physics B》 SCIE EI CAS CSCD 2011年第7期198-204,共7页 中国物理B（英文版）

基金 Project supported by the National Natural Science Foundation of China (Grant Nos.10774020 and 11074028)

关键词 NONLINEARITY Bose-Hubbard model quantum phase transition nonlinearity, Bose-Hubbard model, quantum phase transition

分类号 O431.2 [机械工程—光学工程]

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Chinese Physics B

2011年第7期

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Effective Bose-Hubbard interaction with enhanced nonlinearity in an array of coupled cavities

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