Breather-impurity interactions and modulational instability in a quantum 2D Klein–Gordon chain R. Abouem A. Ribama, Z. I. Djoufack and J. P. Nguenang Eur. Phys. J. B, 95 5 (2022) 86 Published online: 23 May 2022 DOI: 10.1140/epjb/s10051-022-00337-6