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

S. Haddad and R. Bennaceur ()

The European Physical Journal B: Condensed Matter and Complex Systems, 1999, vol. 11, issue 2, 227-233

Abstract: By means of perturbative renormalization approach we study the effect of 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 a crossover takes place at a finite value t ⊥ which increases as the amplitude of umklapp process increases. For t ⊥ > t ⊥c the system undergoes a phase transition to the spin density wave phase (SDW) via the two particle hopping process, while for t ⊥ > t ⊥c the system undergoes a crossover to the two dimensional Fermi liquid phase via one particle hopping process. Copyright Società Italiana di Fisica, Springer-Verlag 1999

Keywords: 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-T c compounds, (search for similar items in EconPapers)
Date: 1999
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DOI: 10.1007/s100510050933

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