https://doi.org/10.1007/s100510050933
Effect of relevant umklapp process on the two-leg Hubbard ladder with a half-filled band under pressure
Laboratoire de Physique de la Matière Condensée, Département de Physique,
Faculté des Sciences de Tunis,
Campus universitaire, 1060 Tunis, Tunisia
Corresponding author: a Raouf.Bennaceur@fst.rnu.tn
Received:
25
December
1998
Published online: 15 September 1999
By means of perturbative renormalization approach we study the effect of relevant
umklapp process on dimensional crossover caused by interladder one particle hopping
in weakly coupled two-leg Hubbard ladders with a half filled-band. We found
that a crossover takes place at a finite value 
which
increases as the amplitude of umklapp process increases. For 
the system undergoes a phase transition to the spin density wave
phase (SDW) via the two particle hopping process, while for
the system undergoes a crossover to the two dimensional
Fermi liquid phase via one particle hopping process.
PACS: 64.60.-i – General studies of phase transitions / 71.27.+a – Strongly correlated electron systems; heavy fermions / 74.25.Dw – Superconductivity phase diagrams / 74.72.-h – High-Tc compounds
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1999
