Green’s function - 4 функцiя Грiна 3 Bose–Einstein condensate 1 Bose–Fermi–Hubbard model 1 Josephson junction 1 Raman scattering 1 current density 1 dielectric film 1 electron-phonon interaction 1 energy gap 1 energy spectrum 1 equation with isotonic operator 1 interface phonons 1 iнтерфейснi фонони 1 nonlinear thermal conductivity 1 optical lattices 1 phase difference 1 phonons 1 positive solution 1 quantum cascade laser 1 quantum dot 1 quasiclassical equation 1 resonant tunneling nanostructure 1 superlattice 1 t - представлення 1 t-representation 1 two-gap superconductor 1 two-sided iterative method 1 густина струму 1