Eur. Phys. J. B 75, 475-480 (2010)
https://doi.org/10.1140/epjb/e2010-00184-4

Coexisting orders in the quarter-filled Hubbard chain with elastic deformations

¹ Departamento de Física, Universidad Nacional de la Plata, C.C. 67, (1900), La Plata, Argentina
² Institut de Physique et Chimie des Matèriaux de Strasbourg, UMR 7504, CNRS-UdS, 23 rue du Loess, BP 43, 67034 Strasbourg Cedex 2, France
³ Facultad de Ingeniería, Universidad Nacional de Lomas de Zamora, Cno. de Cintura y Juan XXIII, 1832 Lomas de Zamora, Argentina

Corresponding authors: ^a rosales@fisica.unlp.edu.ar - ^b cabra@fisica.unlp.edu.ar

Received: 3 February 2010
Published online: 22 June 2010

Abstract

The electronic properties of the quarter-filled extended Peierls-Holstein-Hubbard model that includes lattice distortions and molecular deformations are investigated theoretically using the bosonization approach. We predict the existence of a wide variety of charge-elastic phases depending of the values of the Peierls and Holstein couplings. We also study perturbatively the effects of the Peierls deformation in the nearest-neighbor repulsion V, that may be present in real materials where Coulomb interactions depend strongly on the distance. Our results indicate that the phase diagram may change substantially with V when this term is taken into account.