Valleytronics is a promising candidate to address low-energy signal transport on chip, leveraging the valley pseudospin of electrons as a new degree of freedom to encode, process and store information^{1,2,3,4,5,6,7}. However, valley-carrier nanocircuitry is still elusive, because it essentially requires valley transport that overcomes three simultaneous challenges: high fidelity, high directionality and room-temperature operation. Here we experimentally demonstrate a nanophotonic circuit that can route valley indices of a WS₂ monolayer unidirectionally via the chirality of photons. Two propagating modes are supported in the gap area of the circuit and interfere with each other to generate beating patterns, which exhibit complementary profiles for circular dipoles of different handedness. Based on the spin-dependent beating patterns, we showcase valley fidelity of chiral photons up to 98%, and the circulation directionality is measured to be 0.44 ± 0.04 at room temperature. The proposed nanocircuit can not only enable the construction of large-scale valleytronic networks but also serve as an interactive interface to integrate valleytronics^3,4,5, spintronics^8,9,10 and integrated photonics^11,12,13, opening new possibilities for hybrid spin-valley-photon ecosystems at the nanoscale.

^{Valleytronics 是解决芯片上低能量信号传输的有前途的候选者，它利用电子的谷赝自旋作为编码、处理和存储信息1,2,3,4,5,6,7}的新自由度。然而，谷载流子纳米电路仍然难以捉摸，因为它本质上需要克服三个同时存在的挑战的谷传输：高保真度、高方向性和室温操作。_{在这里，我们通过实验展示了一个纳米光子电路，它可以路由 WS 2}的谷指数单层通过光子的手性单向。电路的间隙区域支持两种传播模式并相互干扰以产生拍频模式，其表现出不同旋向的圆形偶极子的互补轮廓。基于自旋相关的拍频模式，我们展示了高达 98% 的手性光子的谷保真度，并且在室温下测量的循环方向性为 0.44 ± 0.04。拟议的纳米电路不仅可以构建大规模的谷电子网络，而且还可以作为集成谷电子^3,4,5、自旋电子^8,9,10和集成光子学^11,12,13的交互界面，开辟了新的可能性纳米尺度的混合自旋谷光子生态系统。