Possibility of superradiant phase transitions in coupled two-level atoms

• URL: http://arxiv.org/abs/2108.08973v1
• Date: Fri, 20 Aug 2021 02:34:19 GMT
• Title: Possibility of superradiant phase transitions in coupled two-level atoms
• Authors: Tao Liu, Yu-Yu Zhang, Qing-Hu Chen, and Ke-Lin Wang
• Abstract summary: We present the possibility of the quantum phase transition in the coupled two-level atoms in a cavity. The bosonic coherent state technique has been adopted to locate the quantum critical point accurately in the finite-size system. We predict the existence of the superadiant phase transition as the number of atoms increases, satisfying all the constraints imposed by the sum rule.
• Score: 9.382891170863449
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Although the oscillator strength sum rule forbids the phase transition in ideal non-interacting two-level atoms systems, we present the possibility of the quantum phase transition in the coupled two-level atoms in a cavity. The system undergoes the superradiant phase transition in the thermodynamics limit and this transition is account for the atom-atom attractive interaction, exhibiting a violation of the sum rule. The bosonic coherent state technique has been adopted to locate the quantum critical point accurately in the finite-size system. We predict the existence of the superadiant phase transition as the number of atoms increases, satisfying all the constraints imposed by the sum rule.

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