https://doi.org/10.1140/epjb/e2004-00024-2
Spin-gap phase in the extended t-J chain
1
Physics Department, Tunghai University, Taichung,
Taiwan, ROC
2
Physics
Department, National Changhua University of Education, Changhua,
Taiwan, ROC
Corresponding author: a ywlee@mail.thu.edu.tw
Received:
5
June
2003
Revised:
12
October
2003
Published online:
19
February
2004
We study the one-dimensional deformed
model in terms of the continuum field theories. We found that at
low doping concentration and far away from the phase separation
regime, there are two phases: the Luttinger liquid and the
Luther-Emery liquid, depending on
or
, where
.
Moreover, the singlet superconducting correlations are dominant in
the Luther-Emery liquid.
PACS: 71.10.Fd – Lattice fermion models / 71.10.Hf – Non-Fermi-liquid ground states / 74.20.Mn – Non-conventional mechanisms
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2004