Influence of tunnelling-dependent cross-Kerr nonlinearity on photon drag using Sagnac interferometry Sana Ullah, Arif Ullah, Muhammad Javed and Rashid Ahmad Eur. Phys. J. D, 78 5 (2024) 52 Published online: 04 May 2024 DOI: 10.1140/epjd/s10053-024-00846-2