Superlight small bipolarons in the presence of a strong coulomb repulsion

Hague, J. P.; Kornilovitch, P. E.; Samson, J. H. and Alexandrov, A. S. (2007). Superlight small bipolarons in the presence of a strong coulomb repulsion. Physical Review Letters, 98(3) 037002.



We study a lattice bipolaron on a staggered triangular ladder and triangular and hexagonal lattices with
both long-range electron-phonon interaction and strong Coulomb repulsion using a novel continuous-time
quantum Monte Carlo algorithm to solve the two-particle Coulomb-Fro¨hlich model. The algorithm is
preceded by an exact integration over phonon degrees of freedom, and as such is extremely efficient. The
bipolaron effective mass and radius are computed. Bipolarons on lattices constructed from triangular
plaquettes have a novel crablike motion, and are small but very light over a wide range of parameters. We
discuss the conditions under which such particles may form a Bose-Einstein condensate with high
transition temperature, proposing a route to room temperature superconductivity

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