Influence of parity-time symmetry on surface plasmon resonance and Goos–Hänchen shiftFazal Badshah, Aiman Sohrab, Zareen A. Khan, Anwar Ali Khan and ZiauddinEur. Phys. J. Plus, 140 6 (2025) 475DOI: https://doi.org/10.1140/epjp/s13360-025-06425-7