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Symmetry breaking and competition effect in phase transitions
Shuang-Liang Yang1, Wei Luo1, Fazal Badshah2
1Hubei Key Laboratory of Energy Storage and Power Battery, School of Mathematics, Physics and Optoelectronic Engineering, Hubei University of Automotive Technology, Shiyan 442002, People's Republic of China.
Summary
This study explores quantum critical behaviors in photon-magnon models. The coupling phase protects quantum phase transitions (QPTs) and influences tricritical points, revealing insights into symmetry breaking and non-Hermiticity.
Area of Science:
- Quantum physics
- Condensed matter theory
- Photonics and magnonics
Background:
- Photon-magnon systems exhibit competition between level attraction and repulsion.
- Hermiticity in these systems is governed by a phase-dependent coupling factor, distinguishing Hermitian (φ=0) and non-Hermitian (φ=π) regimes.
Purpose of the Study:
- To investigate quantum critical behaviors in Hermitian and non-Hermitian photon-spin models.
- To analyze the protective effect of the coupling phase on quantum phase transitions (QPTs).
- To explore the influence of nonlinear drives, dissipation, and decoherence on tricritical points.
Main Methods:
- Theoretical modeling of a photon-magnon system with a second-order drive.
- Numerical analysis of quantum critical behaviors.
- Examination of coupling phase effects on Hermiticity and phase transitions.
Main Results:
- The coupling phase (φ) demonstrates a protective effect on QPTs.
- New tricritical points are identified, tunable by nonlinear drives, dissipation, and decoherence.
- The competition effect leads to a reversal in order parameter values.
Conclusions:
- The coupling phase is crucial for protecting QPTs in photon-magnon systems.
- Nonlinear drives and environmental factors significantly modulate tricritical points.
- This research offers insights into symmetry breaking and non-Hermiticity in quantum phase transitions.
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