On the eigenvalues of the lattice spin-boson model with at most one photon Elyor B. Dilmurodov, Bekzod I. Bahronov, Khilola G. Khayitova, Gulomjon G. Kurbonov and Rustam T. Norchayev E3S Web Conf., 587 (2024) 01002 Published online: 07 November 2024 DOI: 10.1051/e3sconf/202458701002