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- W3103986526 abstract "We explore an extended quantum Rabi model describing the interaction between a two-mode bosonic field and a three-level atom. Quantum phase transitions of this few degree of freedom model is found when the ratio $eta$ of the atom energy scale to the bosonic field frequency approaches infinity. An analytical solution is provided when the two lowest-energy levels are degenerate. According to it, we recognize that the phase diagram of the model consists of three regions: one normal phase and two superradiant phases. The quantum phase transitions between the normal phase and the two superradiant phases are of second order relating to the spontaneous breaking of the discrete $Z_{2}$ symmetry. On the other hand, the quantum phase transition between the two different superradiant phases is discontinuous with a phase boundary line relating to the continuous $U(1)$ symmetry. For a large enough but finite $eta$, the scaling function and critical exponents are derived analytically and verified numerically, from which the universality class of the model is identified." @default.
- W3103986526 created "2020-11-23" @default.
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- W3103986526 date "2020-07-27" @default.
- W3103986526 modified "2023-10-18" @default.
- W3103986526 title "Quantum phase transitions and critical behaviors in the two-mode three-level quantum Rabi model" @default.
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- W3103986526 doi "https://doi.org/10.1088/1751-8121/ab92be" @default.
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