论文标题
扩展的dicke模型中的自发对称性破坏和husimi Q功能
Spontaneous symmetry breaking and Husimi Q-functions in extended Dicke model
论文作者
论文摘要
我们研究了均衡的光子模式的平均相干光子状态的出现，该光子模式与两级系统的有限阵列相连，以伪纺丝为代表1/2。假蛋白 - 光子的相互作用是通过光子振荡器平衡位置的转移来实现的。我们在分析上证明，不稳定性体现在从凹形到基态能量依赖性的凸的凸的上，对与光子耦合的总伪旋转组件的依赖性。足以使平等性破裂的扰动在轻度耦合的超腹膜极限下倾向于零。我们介绍了有限的假蛋白 - 光子系统的相图，该系统证明了此功能。提出了伪源性和光子子系统的Husimi Q-功能的演变，以及伪旋转熵的沿整个相图的不同轨迹的演变。
We study the emergence of a parity breaking coherent photonic state of a photon mode coupled to finite array of two-level systems, represented by pseudospins 1/2. The pseudospin-photon interaction is realised via a shift of the photonic oscillator equilibrium position by an amount linear in Cartesian component of the total pseudospin. We demonstrate analytically, that the instability is manifested in an upturn from concave to convex of the ground state energy dependence on the total pseudospin component coupled to the photons. The perturbation, sufficient for parity breaking, tends to zero in the ultrastrong limit of light-matter coupling. We present phase diagram of finite pseudospin-photon system, that demonstrates this feature. Evolution of Husimi Q-functions of the pseudospin and photon subsystems, and of the pseudospin entropy, along different trajectories across the phase diagram is presented.
