arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.11047quant-ph
收藏

各向异性量子Rabi模型中超辐射相变的普适动力学

Universal dynamics of superradiant phase transition in the anisotropic quantum Rabi model

Xunda Jiang, Bo Lu, Chengyin Han, Ruihuan Fang, Minhua Zhao, Zhu Ma, Tian Guo, Chaohong Lee

摘要:

研究了各向异性量子Rabi模型中超辐射相变的普遍非平衡动力学。通过引入位置算符和动量算符,利用微扰理论得到了正常相和超辐射相的基态及其激发能隙。我们解析地从激发能隙和临界点附近的发散长度尺度中提取了临界指数,发现临界指数与各向异性比无关。此外,通过模拟临界点附近的实时动力学,我们从相变延迟和发散的长度尺度中数值提取了临界指数,这与解析结果吻合得很好。我们的研究提供了一个动态的方式来探索量子拉比模型中的普遍临界行为。

英文摘要:

We investigate the universally non-equilibrium dynamics of superradiant phase transition in the anisotropic quantum Rabi model. By introducing position and momentum operators, we obtain the ground states and their excitation gaps for both normal and superradiant phases via perturbation theory. We analytically extract the critical exponents from the excitation gap and the diverging length scale near the critical point, and find that the critical exponents are independent upon the anisotropy ratio. Moreover, by simulating the real-time dynamics across the critical point, we numerically extract the critical exponents from the phase transition delay and the diverging length scale, which are well consistent with the analytical ones. Our study provides a dynamic way to explore universal critical behaviors in the quantum Rabi model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑