Bipolaron in anisotropic crystals (arbitrary coupling)
Kashirina N.I., Lakhno V.D.
Institute of Semiconductor Physics of the National Academy of Sciences of Ukraine, Kiev, Ukraine
Institute of Mathematical problems of Biology, Russian Academy of Sciences, Pushchino, Moscow region, Russia
Abstract. The work is devoted to obtaining the bipolaron functional in anisotropic crystals by Buimistrov-Pekar method for an arbitrary electron-phonon coupling. The effect of electron correlations related to the direct dependence of the wave function from the distance between the electrons on bipolaron energy is studied. The single-center and two-center (coaxial configuration) bipolaron models in crystals with anisotropic effective mass for the limiting case of quasi-systems (the system “light axis”) were compared.
Key words: electron-phonon interaction, anisotropic crystals, polaron, bipolaron.