Transverse Non-Hermitian Drift Induced by the Quantum Metric of Exceptional Rings

Author(s): Zhaoyang Zhang, Ismaël Septembre, Zhenzhi Liu, Pavel Kokhanchik, Shun Liang, Fu Liu, Changbiao Li, Hongxing Wang, Maochang Liu, Yanpeng Zhang, Min Xiao, Guillaume Malpuech, and Dmitry Solnyshkov Exceptional rings are sets of non-Hermitian singularities stemming from Dirac points. We study them theoretically and experimentally in an atomic vapor cell. We demonstrate the formation of an exceptional ring in a photonic honeycomb lattice by showing a transition between conical diffraction and no… [Phys. Rev. Lett. 135, 263802] Published Tue Dec 30, 2025