polaron полярон 3 - 2 electron 2 quantum dot 2 Buimistrov–Pekar method 1 Coulomb repulsion 1 Fr¨ohlich Hamiltonian 1 Green’s function method 1 PACS 71.38, 71.38. i, 73.20.D, 74.80.D 1 all-coupling approximation 1 autolocalization 1 binding energy 1 bipolaron 1 bisolectron 1 bisoliton 1 cluster 1 confining potential 1 electron-deformation potential 1 electron-phonon interaction 1 exciton 1 ground-state energy 1 high-temperature superconductivity 1 hole 1 lattice anharmonicity 1 model Hamiltonian 1 phonon confinement 1 бiполярон 1 високотемпературна надпровiднiсть 1 гамiльтонiан Фрьолiха 1