Heterostructures combining a thin layer of quantum emitters and planar nanostructures enable custom-tailored photoluminescence in an integrated fashion. Here, we demonstrate a photonic Rashba effect from valley excitons in a WSe₂ monolayer, which is incorporated into a photonic crystal slab with geometric phase defects, that is, into a Berry-phase defective photonic crystal. This phenomenon of spin-split dispersion in momentum space arises from a coherent geometric phase pickup assisted by the Berry-phase defect mode. The valley excitons effectively interact with the defects for site-controlled excitation, photoluminescence enhancement and spin-dependent manipulation. Specifically, the spin-dependent branches of photoluminescence in momentum space originate from valley excitons with opposite helicities and evidence the valley separation at room temperature. To further demonstrate the versatility of the Berry-phase defective photonic crystals, we use this concept to separate opposite spin states of quantum dot emission. This spin-enabled manipulation of quantum emitters may enable highly efficient metasurfaces for customized planar sources with spin-polarized directional emission.

结合薄层量子发射器和平面纳米结构的异质结构以集成方式实现定制的光致发光。在这里，我们展示了 WSe _{2 中}谷激子的光子 Rashba 效应单层，将其结合到具有几何相位缺陷的光子晶体板中，即结合到 Berry 相缺陷光子晶体中。这种动量空间中的自旋分裂色散现象是由 Berry 相缺陷模式辅助的相干几何相位拾取引起的。谷激子有效地与位点控制激发、光致发光增强和自旋相关操作的缺陷相互作用。具体而言，动量空间中光致发光的自旋相关分支源自具有相反螺旋度的谷激子，并证明了室温下的谷分离。为了进一步证明 Berry 相缺陷光子晶体的多功能性，我们使用这个概念来分离量子点发射的相反自旋态。