Rotationally-invariant slave-bosons for Strongly Correlated Superconductors

Details Rotationally-invariant slave-bosons for Strongly Correlated Superconductors Rotationally-invariant slave-bosons for Strongly Correlated Superconductors

2009-02-11

arxiv.org/abs/0902.1854v2

Phys. Rev. B 80, 115120 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

18 pages, 7 figures

Scientific paper

10.1103/PhysRevB.80.115120

We extend the rotationally invariant formulation of the slave-boson method to superconducting states. This generalization, building on the recent work by Lechermann et al. [Phys. Rev. B {\bf 76}, 155102 (2007)], allows to study superconductivity in strongly correlated systems. We apply the formalism to a specific case of strongly correlated superconductivity, as that found in a multi-orbital Hubbard model for alkali-doped fullerides, where the superconducting pairing has phonic origin, yet it has been shown to be favored by strong correlation owing to the symmetry of the interaction. The method allows to treat on the same footing the strong correlation effects and the interorbital interactions driving superconductivity, and to capture the physics of strongly correlated superconductivity, in which the proximity to a Mott transition favors the superconducting phenomenon.

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