Author(s): Yuto Moritake, Nozomi Ogawa, Issei Takeda, Yusuke Ohinata, Takahiro Uemura, Taiki Yoda, Kenta Takata, Eiichi Kuramochi, Hisashi Sumikura, and Masaya Notomi A non-Hermitian point gap (NHPG) is a unique phenomenon in non-Hermitian systems and induces a non-Hermitian skin effect (NHSE). In photonic crystals, NHPG and NHSE have previously been explored mainly through material loss, where the typically low $Q$ factors make direct observation of complex freq… [Phys. Rev. Lett. 137, 046903] Published Thu Jul 23, 2026