https://doi.org/10.1007/s100510170327
Commensurate-incommensurate transition in two-coupled chains of nearly half-filled electrons
1
Department of Physics, Nagoya University, Nagoya
464-8602, Japan
2
Laboratoire de Physique des Solides (CNRS UMR
8502) , Université Paris-Sud, Bâtiment 510, 91405 Orsay, France
3
CREST, Japan Science and Technology Corporation (JST), Japan
4
Laboratoire de Physique Théorique (CNRS UMR 8549) , École
Normale Supérieure, 24 rue Lhomond 75005 Paris, France
Corresponding author: a e43428a@nucc.cc.nagoya-u.ac.jp
Received:
31
July
2000
Published online: 15 January 2001
We investigate the physical properties of two coupled
chains of electrons, with a nearly half-filled band, as a function
of the interchain hopping 
and the doping. We show that
upon doping, the system undergoes a metal-insulator transition well
described by a commensurate-incommensurate transition. By using
bosonization and renormalization we determine the full phase
diagram of the system, and the physical quantities such as the
charge gap. In the commensurate phase two different regions, for
which the interchain hopping is relevant and irrelevant exist,
leading to a confinement-deconfinement crossover in
this phase. A minimum of the charge gap is observed for values of
close to this crossover. At large the region
of the commensurate phase is enhanced, compared to a single
chain. At the metal-insulator transition the Luttinger parameter
takes the universal value 
, in agreement with previous
results on special limits of this model.
PACS: 71.10.Hf – Non-Fermi-liquid ground states, electron phase diagrams and phase transitions in model systems / 71.10.Pm – Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.) / 71.30.+h – Metal-insulator transitions and other electronic transitions
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2001
