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http://ir.ncue.edu.tw/ir/handle/987654321/14091
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| Title: | Two-leg t-J ladder: A Mean-field Description |
| Authors: | Lee, Yu-Li;Lee, Y. W.;Mou, C. Y.;Weng, Z. Y. |
| Contributors: | 物理學系 |
| Date: | 1999
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| Issue Date: | 2012-09-10T06:07:26Z
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| Publisher: | The American Physical Society |
| Abstract: | 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. |
| Relation: | Phys. Rev. B, 60(19): 13418-13428 |
| Appears in Collections: | [物理學系] 期刊論文
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