Polaron cross-overs and d-wave superconductivity in Hubbard-Holstein model

Abstract

We present a theoretical study of superconductivity of polarons in the Hubbard-Holstein model. A residual kinematic interaction proportional to the square of the polaron hopping energy between polarons and phonons provides a pairing field for the polarons. We find that superconducting instability in the d-wave channel is possible with small transition temperatures which is maximum in the large to small polaron cross-over region. An s-wave instability is found to be not possible when the effective on-site interaction between polarons is repulsive.

References in corpus (4)

• Dynamical mean-field theory for pairing and spin gap in the attractive Hubbard model
• Phase Separation close to the density-driven Mott transition in the Hubbard-Holstein model
• First- and Second Order Phase Transitions in the Holstein-Hubbard Model
• Quantum Monte Carlo study of the 3D attractive Hubbard model

Cited by in corpus (2)

• Small Polarons in Transition Metal Oxides
• Variational Lang-Firsov approach plus Møller-Plesset perturbation theory with applications to ab initio polariton chemistry