Eur. Phys. J. B 37, 7-14 (2004)
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

Abstract

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.