Stripe orders driven by long-range Coulomb forces in the 2D-Hubbard model
Dipartimento di Fisica "E.R. Caianiello", University of Salerno and Unità INFM of Salerno, Baronissi (Sa), Italy
Corresponding author: a email@example.com
Published online: 15 April 2001
Within the single band 2D-Hubbard model treated by means of a strong-coupling approach based on a cumulant expansion and a nonstandard diagrammatic technique, we discuss the existence of critical charge fluctuations that could give rise to an instability towards a phase separation (PS). It turns out that such instability exists and evolves into an incommensurate charge density wave (ICDW) when long-range Coulomb forces are taken into account. We find a stripe phase with a crossover from diagonal to vertical stripes at increasing doping in the range and increasing Coulomb potential U, similarly to recent NMR experiments on .
PACS: 71.10.Fd – Lattice fermion models (Hubbard model, etc.) / 71.45.Lr – Charge-density-wave systems / 71.27.+a – Strongly correlated electron systems; heavy fermions
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2001