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题名: Two-leg t-J ladder: A Mean-field Description
作者: Lee, Yu-Li;Lee, Y. W.;Mou, C. Y.;Weng, Z. Y.
贡献者: 物理學系
日期: 1999
上传时间: 2012-09-10T06:07:26Z
出版者: The American Physical Society
摘要: Two-leg t-J ladders are investigated in the framework of a combination of the phase string formulation and bond-operator representation. We develop 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 phase—the so-called C1S0 phase. Both of them are characterized by the resonating-valence-bond (RVB) order parameter, with gap opened up in all spin excitations. The ground state of the doped phase is intrinsically a superconductor with a d-wave symmetry, which is driven by the RVB correlations. 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 analyzed in comparison with other approaches.
關聯: Phys. Rev. B, 60(19): 13418-13428
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