| Effective Bose-Hubbard interaction with enhanced nonlinearity in an array of coupled cavities |
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| 作者姓名： | 周玲 刘忠菊 闫伟斌 穆青霞 |
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| 作者单位： | School of Physics and Optoelectronics Engineering,Dalian University of Technology |
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| 基金项目： | Project supported by the National Natural Science Foundation of China （Grant Nos. 10774020 and 11074028）. |
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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 Mott-insulator as well as the phase transition from the similar Mott-insulator to superfluid.Through jointly adjusting the classical Rabi frequency and the detuning,the nonlinearity can be improved.
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| 关 键 词： | nonlinearity Bose-Hubbard model quantum phase transition |
Effective Bose-Hubbard interaction with enhanced nonlinearity in an array of coupled cavities |
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| Zhou Ling,Yan Wei-Bin,Liu Zhong-Ju,Mu Qing-Xia.Effective Bose-Hubbard interaction with enhanced nonlinearity in an array of coupled cavities[J].Chinese Physics B,2011(7):198-204. |
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| Authors: | Zhou Ling Yan Wei-Bin Liu Zhong-Ju Mu Qing-Xia |
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| Institution: | School of Physics and Optoelectronics Engineering, Dalian University of Technology, Dalian 116024, China |
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| Abstract: | nonlinearity, Bose-Hubbard model, quantum phase transition |
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| Keywords: | nonlinearity Bose-Hubbard model quantum phase transition |
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