近日，山西大学贾锁堂课题组研究了非平衡三能级Dicke模型的集体动力学。相关成果已于2023年3月28日在国际学术期刊《物理评论A》上发表。

该课题组研究了一个三能级Dicke模型，它在V型结构下考虑了闭合和开放条件。该模型具有相互作用哈密顿的独立可调的共旋和反旋耦合强度，是标准Dicke模型的一般化，具有多个不同的参数区域。研究人员基于平均场方法和第三量子化分析，发现该系统展现出丰富的量子相行为，包括不同的超辐射定点、多相共存和极限循环振荡。

此外，研究人员发现腔耗散稳定了一族反转自旋相干稳态，其稳定区域可以通过适当调节共旋和反旋耦合之间的失衡来扩大或缩小。这种性质提供了一个概念上不同的场景，用于高保真度地制备相干原子态。

附：英文原文

Title: Collective dynamics of the unbalanced three-level Dicke model

Author: Jingtao Fan, Suotang Jia

Issue&Volume: 2023/03/28

Abstract: We study a three-level Dicke model in V configuration under both closed and open conditions. With independently tunable corotating and counterrotating coupling strength of the interaction Hamiltonian, this model is a generalization of the standard Dicke model that features multiple distinct parameter regimes. Based on a mean-field approach and third quantization analysis, it is found that the system exhibits rich quantum phase behaviors, including distinct superradiant fixed points, multiphase coexistence, and limit-cycle oscillation. In particular, the cavity dissipation stabilizes a family of inverted spin-coherent steady states whose stability region can be enlarged or reduced by properly tuning the imbalance between the corotating and counterrotating interactions. This property provides a conceptually different scenario to prepare the coherent atomic state with high fidelity.

DOI: 10.1103/PhysRevA.107.033711

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.107.033711