点击次数：

论文类型：期刊论文

发表时间：2011-07-01

发表刊物：CHINESE PHYSICS B

收录刊物：Scopus、SCIE、EI、ISTIC

卷号：20

期号：7

ISSN号：1674-1056

关键字：nonlinearity; Bose-Hubbard model; quantum phase transition

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.