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arXiv 0709.1352quant-ph
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Dicke-Bose-哈伯德模型中光的量子相变

Quantum Phase Transitions of Light in the Dicke-Bose-Hubbard model

Soi-Chan Lei, Ray-Kuang Lee

摘要:

本文将Dicke-Bose-哈伯德模型推广到任意数目的二能级原子,讨论了原子-光子系统中光的量子相变。导出了双原子本征能、有效拉比频率和临界化学势的表达式。用自洽方法得到了两个二能级原子共振时的相图,该相图表明了从莫特绝缘体到超流态的转变,并给出了平均激发图作为验证.我们通过构造任意数目的二能级原子的缀饰态基来说明该方法的通用性。此外,我们还发现相图中的莫特绝缘体瓣会随着原子数的增加而破碎。这一结果为研究Dicke-like和Hubbard-like模型的组合对利用光子模拟强关联电子系统的影响提供了一个步骤。

英文摘要:

We extend the idea of quantum phase transitions of light in atom-photon system with Dicke-Bose-Hubbard model for arbitrary number of two-level atoms. The formulations of eigenenergies, effective Rabi frequencies, and critical chemical potentials for two atoms are derived. With a self-consistent method, we obtain a complete phase diagram for two two-level atoms on resonance, which indicates the transition from Mott insulator to superfluidity and with a mean excitations diagram for confirmation. We illustrate the generality of the method by constructing the dressed-state basis for arbitrary number of two-level atoms. In addition, we show that the Mott insulator lobes in the phase diagrams will smash out with the increase of atom numbers. The results of this work provide a step for studying the effects with combinations of Dicke-like and Hubbard-like models to simulate strongly correlated electron systems using photons.

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。

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