Polaron and bipolaron formation in the Hubbard-Holstein model: role of next-nearest neighbor electron hopping

Details Polaron and bipolaron formation in the Hubbard-Holstein model: role of next-nearest neighbor electron hopping Polaron and bipolaron formation in the Hubbard-Holstein model: role of next-nearest neighbor electron hopping

2001-06-28

arxiv.org/abs/cond-mat/0106586v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 figures

Scientific paper

10.1103/PhysRevB.64.155105

The influence of next-nearest neighbor electron hopping, $t^{\prime}$, on the polaron and bipolaron formation in a square Hubbard-Holstein model is investigated within a variational approach. The results for electron-phonon and electron-electron correlation functions show that a negative value of $t^{\prime}$ induces a strong anisotropy in the lattice distortions favoring the formation of nearest neighbor intersite bipolaron. The role of $t^{\prime}$, electron-phonon and electron-electron interactions is briefly discussed in view of the formation of charged striped domains.

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