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

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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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 language	English
Pages (from-to)	313-321
Number of pages	9
Journal	Chinese Journal of Physics
Volume	38
Issue number	2-2
Publication status	Published - 2000

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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

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.",

author = "Mou, {C. Y.} and Lee, {Y. L.} and Lee, {Y. W.} and Weng, {Z. Y.}",

year = "2000",

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pages = "313--321",

journal = "Chinese Journal of Physics",

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T1 - A mean-field theory for the spin-gap phase in the two-leg t-J ladder

AU - Mou, C. Y.

AU - Lee, Y. L.

AU - Lee, Y. W.

AU - Weng, Z. Y.

PY - 2000

Y1 - 2000

N2 - 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.

AB - 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.

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JO - Chinese Journal of Physics

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IS - 2-2

ER -

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

Abstract

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