Effect of relevant umklapp process on the two-leg Hubbard ladder with a half-filled band under pressure

摘要: By means of perturbative renormalization approach we study the effect relevant umklapp process on dimensional crossover caused by interladder one particle hopping t⊥ in weakly coupled two-leg Hubbard ladders with a half filled-band. We found that takes place at finite value which increases as amplitude increases. For t⊥c system undergoes to two Fermi liquid phase via process.