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Spin-gap phase in the extended $\mathsf{t-J}$ chain

2003; Springer Science+Business Media; Volume: 37; Issue: 1 Linguagem: Inglês

10.1140/epjb/e2004-00024-2

1434-6036

Yu-Wen Lee, Yu-Li Lee,

Quantum and electron transport phenomena

We study the one-dimensional deformed t - t ′ - J 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 t′/t < (t′/t) c or t′/t > (t′/t) c , where (t′/t) c > 0. Moreover, the singlet superconducting correlations are dominant in the Luther-Emery liquid.