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Dicke Quantum Phase Transition for a Bose-Einstein Condensate in a Two-Mode Optical Cavity

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Abstract

In this paper we mainly discuss the ground state properties of the two-mode Dicke model, which is realized in an ensemble of two-level atoms interacting simultaneously with two quantized cavity fields. We reveal rich phase diagrams and discover the second-order quantum phase transition from the normal phase to the superradiant phase by means of the spin-coherent-state variational method. While the critical phase transition point can be shifted by the detuning of the cavity mode or the atom-field coupling imbalance parameter. The collective atom-field coupling imbalance parameter can make the phase transition point symmetrically shift left or right in the resonance or non-resonance. If the two collective atom-photon coupling strengths are not equal in the resonance, the system may be in different phases, while the phases occupied are completely symmetrical. When one of the coupling constants vanishes or two couplings are equal, the ground-states’s properties and related QPT reduce to that of a standard or an ordinary Dicke model.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 11772177, 61505100, 51502189, 61575112), and the natural science foundation of Shanxi Province (Grant No. 201701D221001).

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Correspondence to Ni Liu.

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Liu, N., Zhao, X. & Liang, JQ. Dicke Quantum Phase Transition for a Bose-Einstein Condensate in a Two-Mode Optical Cavity. Int J Theor Phys 58, 558–574 (2019). https://doi.org/10.1007/s10773-018-3954-5

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  • DOI: https://doi.org/10.1007/s10773-018-3954-5

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