Chiral quantum phases and tricriticality in a Dicke triangle
Chiral quantum phases and tricriticality in a Dicke triangle
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DOI：
10.1007/s44214-022-00019-5
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发表时间：
2022-09
期刊：
影响因子：
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通讯作者：
G. Cheng;Diego Fallas Padilla;Tao Deng;Yu-Yu Zhang-Yu;H. Pu
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作者：
G. Cheng;Diego Fallas Padilla;Tao Deng;Yu-Yu Zhang-Yu;H. Pu
在三临界迪凯三角形（TDT）中发现了量子三临界性和奇异相的存在，在TDT中，三个腔通过人工磁场相互连接，每个腔都包含一个三能级原子系综.常规超辐射相（SR）通过一阶和二阶边界连接到正常相，三临界点位于这些边界的交点处。除了SR相，一个手征超辐射（CSR）相被发现通过调谐人工磁场。该相位的特征在于非零光子流，其边界呈现手征三临界点（CTCP）。通过对不同临界指数的研究，我们能够区分CTCP和TCP的普适类的二阶临界点，以及发现两个不同的超辐射相之间的独特的临界行为。TDT可以在各种系统中实现，包括光学腔中的原子以及电路QED系统，允许探索各种各样的临界流形。
The existence of quantum tricriticality and exotic phases are found in a tricritical Dicke triangle (TDT) where three cavities, each one containing an ensemble of three-level atoms, are connected to each other through the action of an artificial magnetic field. The conventional superradiant phase (SR) is connected to the normal phase through first- and second-order boundaries, with tricritical points located at the intersection of such boundaries. Apart from the SR phase, a chiral superradiant (CSR) phase is found by tuning the artificial magnetic field. This phase is characterized by a nonzero photon current and its boundary presents chiral tricritical points (CTCPs). Through the study of different critical exponents, we are able to differentiate the universality class of the CTCP and TCP from that of second-order critical points, as well as find distinctive critical behavior among the two different superradiant phases. The TDT can be implemented in various systems, including atoms in optical cavities as well as the circuit QED system, allowing the exploration of a great variety of critical manifolds.