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19 April 2024

» arxiv » cond-mat/0106586

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Polaron and bipolaron formation in the Hubbard-Holstein model: role of next-nearest neighbor electron hopping
G. De Filippis ; V. Cataudella ; G. Iadonisi ; V. Marigliano Ramaglia ; C. A. Perroni ; F. Ventriglia ;
Date:	28 Jun 2001
Subject:	Strongly Correlated Electrons \| cond-mat.str-el
Abstract:	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.
Source:	arXiv, cond-mat/0106586
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