Superlight small bipolarons from realistic long-range Coulomb and Fröhlich interactions

Details Superlight small bipolarons from realistic long-range Coulomb and Fröhlich interactions Superlight small bipolarons from realistic long-range Coulomb and Fröhlich interactions

2011-12-14

arxiv.org/abs/1112.3230v2

Physics

Condensed Matter

Superconductivity

Calculation section and discussion of gap have been updated. Revised calculations now enhance the predicted T_c in our model t

Scientific paper

We report analytical and numerical results on the two-particle states of the polaronic t-Jp model derived recently with realistic Coulomb and electron-phonon (Frohlich) interactions in doped polar insulators. Eigenstates and eigenvalues are calculated for two different geometries. Our results show that the ground state is a bipolaronic singlet, made up of two polarons. The bipolaron size increases with increasing ratio of the polaron hopping integral t to the exchange interaction Jp but remains small compared to the system size in the whole range 0

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