Exceptional points and dynamics of a non-Hermitian two-level system without 𝒫𝒯 symmetry Qiu Wang, Jiao Wang, H. Z. Shen, S. C. Hou and X. X. Yi EPL, 131 3 (2020) 34001 Published online: 26 August 2020 DOI: 10.1209/0295-5075/131/34001