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

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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
Issue number2-2
Publication statusPublished - 2000

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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