Exceptional points and dynamics of a non-Hermitian two-level system without 𝒫𝒯 symmetryQiu Wang, Jiao Wang, H. Z. Shen, S. C. Hou and X. X. YiEPL, 131 3 (2020) 34001DOI: https://doi.org/10.1209/0295-5075/131/34001