Breather-impurity interactions and modulational instability in a quantum 2D Klein–Gordon chainR. Abouem A. Ribama, Z. I. Djoufack and J. P. NguenangEur. Phys. J. B, 95 5 (2022) 86DOI: https://doi.org/10.1140/epjb/s10051-022-00337-6