Graphene p–n junction (PNJ) with co-propagating spin-valley polarized quantum Hall (QH) edges is a promising platform for studying electron interferometry. Though several conductance measurements have been attempted for such PNJs, the edge dynamics of the spin-valley symmetry broken edge states remain unexplored. In this work, we present the measurements of conductance together with shot noise, an ideal tool to unravel the dynamics, at low temperature, in a dual graphite gated hexagonal boron nitride encapsulated high mobility graphene device. The conductance data show that the symmetry broken QH edges at the PNJ follow spin selective equilibration. The shot noise results as a function of both p and n side filling factors reveal the unique dependence of the scattering mechanism. Remarkably, the scattering is found to be fully tunable from incoherent to coherent regime with the increasing number of QH edges at the PNJ, shedding crucial insights of edge dynamics.

石墨烯PN结（PNJ）与共传播的自旋谷极化量子霍尔（QH）边缘是研究电子干涉法的有前途的平台。尽管已尝试了针对此类PNJ的几种电导测量，但自旋谷对称破折边态的边沿动力学仍未探索。在这项工作中，我们介绍了电导率的测量以及散粒噪声，散粒噪声是在双石墨门控六角形氮化硼封装高迁移率石墨烯器件中在低温下揭示动力学的理想工具。电导数据表明，PNJ处对称的断裂QH边缘遵循自旋选择性平衡。散粒噪声作为p和n侧填充因子的函数，揭示了散射机制的独特依赖性。值得注意的是