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

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journal contribution
posted on 2013-01-31, 14:15 authored by A.S. Alexandrov, John Samson, G. Sica
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 (Fr¨ohlich) 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 in the whole range 0 t/Jp 1. Furthermore, the model exhibits a phase transition to a superconducting state with a critical temperature well in excess of 100K since the small bipolarons are perfectly mobile. In the range t/Jp 1, there are distinct charge and spin gaps opening in the density of states, specific heat, and magnetic susceptibility well above Tc.

History

School

  • Science

Department

  • Physics

Citation

ALEXANDROV, A.S., SAMSON, J.H. and SICA, G., 2012. Superlight small bipolarons from realistic long-range Coulomb and Frohlich interactions. Physical Review B, 85 (10), 104520 (4pp.).

Publisher

© Americal Physical Society

Version

  • VoR (Version of Record)

Publication date

2012

ISSN

1098-0121

Language

  • en

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