Quantum mixed phases of a two-dimensional polarized degenerate Fermi gas in an optical cavity.
Quantum mixed phases of a two-dimensional polarized degenerate Fermi gas in an optical cavity.
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DOI：
10.1038/s41598-017-10686-3
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发表时间：
2017-09-05
影响因子：
4.6
通讯作者：
Jia S
中科院分区：
文献类型：
--
作者：
Feng Y;Zhang K;Fan J;Mei F;Chen G;Jia S
超冷费米子与高精细度光腔的耦合可以产生新颖的多体现象，目前已引起人们的极大兴趣。在这里，我们考虑实现的费米-迪克模型与可控参数，基于二维极化简并费米气体耦合到一个光学腔。在平均场近似下，我们解析地研究了这类系统的基态性质。我们发现系统可以呈现出一个丰富的相图依赖于费米子-光子耦合强度和原子共振频率。与玻色子对应物相比，在弱原子共振频率下，可以发生具有两个费米面的超辐射相和正常相之间的一级量子相变，并且存在唯一的正常相和超辐射相共存的混合相。文中还讨论了实验结果的检验。
The coupling of ultracold fermions to a high-finesse optical cavity can result in novel many-body phenomena, and has attracted significant interests at present. Here we consider a realization of the Fermi-Dicke model with controllable parameters, based on a two-dimensional polarized degenerate Fermi gas coupled to an optical cavity. We analytically investigate the ground-state properties of such system under the mean-field approximation. We find the system can exhibit a rich phase diagram depending on the fermion-photon coupling strength and the atomic resonant frequency. Contrasting to the bosonic counterpart, a first-order quantum phase transition between the superradiant phase and the normal phase featuring two Fermi surfaces can occur for the weak atomic resonant frequency, and there is a unique mixed phase where this normal phase and the superradiant phase coexist. The experimental detection of our results is also discussed.