Spencer Michael S, Fu Yongping, Schlaus Andrew P, Hwang Doyk, Dai Yanan, Smith Matthew D, Gamelin Daniel R, Zhu X-Y
Department of Chemistry, Columbia University, New York, NY 10027, USA.
Department of Chemistry, University of Washington, Seattle, WA 98195-1700, USA.
Sci Adv. 2021 Dec 3;7(49):eabj7667. doi: 10.1126/sciadv.abj7667. Epub 2021 Dec 1.
Spin-orbit coupling (SOC) is responsible for a range of spintronic and topological processes in condensed matter. Here, we show photonic analogs of SOCs in exciton-polaritons and their condensates in microcavities composed of birefringent lead halide perovskite single crystals. The presence of crystalline anisotropy coupled with splitting in the optical cavity of the transverse electric and transverse magnetic modes gives rise to a non-Abelian gauge field, which can be described by the Rashba-Dresselhaus Hamiltonian near the degenerate points of the two polarization modes. With increasing density, the exciton-polaritons with pseudospin textures undergo phase transitions to competing condensates with orthogonal polarizations. Unlike their pure photonic counterparts, these exciton-polaritons and condensates inherit nonlinearity from their excitonic components and may serve as quantum simulators of many-body SOC processes.
自旋轨道耦合（SOC）在凝聚态物质中引发了一系列自旋电子学和拓扑过程。在此，我们展示了激子极化激元和它们在由双折射卤化铅钙钛矿单晶构成的微腔中的凝聚态中的SOC光子类似物。晶体各向异性与横向电场和横向磁场模式在光学腔中的分裂相结合，产生了一个非阿贝尔规范场，该场在两个偏振模式的简并点附近可以用Rashba-Dresselhaus哈密顿量来描述。随着密度增加，具有赝自旋纹理的激子极化激元经历相变，转变为具有正交偏振的竞争凝聚态。与纯光子对应物不同，这些激子极化激元和凝聚态从其激子成分继承了非线性，并且可以用作多体SOC过程的量子模拟器。
