A mean-field theory for the spin-gap phase in the two-leg t-J ladder

C. Y. Mou, Y. L. Lee, Y. W. Lee, Z. Y. Weng

Research output: Contribution to journalArticle

Abstract

Two-leg t-J ladders are investigated in the framework of a combination of the phass string formulation and bond-operator representation. We develope a mean-field theory in the strong rung interaction regime, i.e. J ≫ J, t, which provides a unified description of the undoped insulating phase and the low doping spin gap phase. The ground state of the doped phase is intrinsically a superconductor with a d-wave symmetry gap driven by the t- term. The ground-state energy is in good agreement with numerical results. Phase separation is shown to occur beyond some critical value of J/t for given doping concentration. The local structure of hole pairs as well as the spectra of various spin and charge modes are also analyzed. copy; 2000 THE PHYSICAL SOCIETY OF THE REPUBLIC OF CHINA.

Original languageEnglish
Pages (from-to)313-321
Number of pages9
JournalChinese Journal of Physics
Volume38
Issue number2-2
Publication statusPublished - 2000 Dec 1

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ladders
ground state
Taiwan
strings
formulations
operators
symmetry
energy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Mou, C. Y. ; Lee, Y. L. ; Lee, Y. W. ; Weng, Z. Y. / A mean-field theory for the spin-gap phase in the two-leg t-J ladder. In: Chinese Journal of Physics. 2000 ; Vol. 38, No. 2-2. pp. 313-321.
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Mou, CY, Lee, YL, Lee, YW & Weng, ZY 2000, 'A mean-field theory for the spin-gap phase in the two-leg t-J ladder', Chinese Journal of Physics, vol. 38, no. 2-2, pp. 313-321.

A mean-field theory for the spin-gap phase in the two-leg t-J ladder. / Mou, C. Y.; Lee, Y. L.; Lee, Y. W.; Weng, Z. Y.

In: Chinese Journal of Physics, Vol. 38, No. 2-2, 01.12.2000, p. 313-321.

Research output: Contribution to journalArticle

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