Bond-order driven metallic stripes in the t– U– J model

Abstract

We studied the stripe formation in the t– U– J model with the nearest neighbor antiferromagnetic spin correlation J and the onsite Coulomb repulsion U. The model was decoupled using the Hartree–Fock–Bogoliubov approximation in the real space. The resulting Bogoliubov–de-Gennes equation was then solved as the doping concentration is varied, with the d-wave pairing, nearest neighbor bond-order, local spin density, and charge density order parameters determined self-consistently. An antiphase metallic stripe with magnetic unit cell of 8 a at hole doping 1/8 was obtained when the next nearest hopping t ′ is allowed in this model. By comparing the results from with and without the bond-order parameter with each other, we conclude that the bond-centered metallic stripes are stabilized by the additional reduction in kinetic energy when the bond order is developed.