Abstract
The two-photon Rabi model describes the interaction between a two-level system and a single bosonic mode via two-photon process. By means of mean-field approximation, we investigate the quantum phase transition, which corresponds to a jump from the single well to double well structure for the energy function in the ultra-strong coupling regime. Taking the classical limit for the atom (two-level system) partner, we also study the squeezing of the cavity field in both of the normal and super-radiance phases.
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Hu, XL. The Phase Transition in Two-Photon Rabi Model Under Mean Field Approximation. Int J Theor Phys 58, 3765–3772 (2019). https://doi.org/10.1007/s10773-019-04246-w
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DOI: https://doi.org/10.1007/s10773-019-04246-w