Influence of parity-time symmetry on surface plasmon resonance and Goos–Hänchen shift Fazal Badshah, Aiman Sohrab, Zareen A. Khan, Anwar Ali Khan and Ziauddin Eur. Phys. J. Plus, 140 6 (2025) 475 Published online: 03 June 2025 DOI: 10.1140/epjp/s13360-025-06425-7