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• W2081005323 abstract "By using the bosonization approach and the weak-coupling renormalization group (RG) techniques, we study the phase diagram of one-dimensional half-filled t–U–J model parametrized by exchange anisotropy λ (0 ≤ λ ≤ 2) in the weak-coupling regime. In the case of anisotropic antiferromagnetic exchange (J > 0) and on-site repulsion (U > 0), the ground state is characterized by the spin-density-wave (SDW) and bond-charge-density-wave (BCDW) insulating phases. We identify the SDW correlation corresponding to the transverse SDW ± phases with a gapless spin excitation (Δ s =0) for λ < 4/3 and to the longitudinal SDW z phase with a spin gap (Δ s > 0) for λ > 4/3, respectively. The charge excitation is always gapped (Δ c > 0) in the whole regime, and the BCDW and SDW z phases show a long-range order. We also examine effects of the nonlocal Umklapp scattering of parallel-spin electrons, which play a role to weaken the BCDW phase and to enhance the SDW phase slightly. The results demonstrate that the properties of our model are not identical with those of the conventional t–U–J model." @default.
• W2081005323 created "2016-06-24" @default.
• W2081005323 creator A5016322821 @default.
• W2081005323 creator A5061226854 @default.
• W2081005323 date "2010-11-10" @default.
• W2081005323 modified "2023-09-27" @default.
• W2081005323 title "PHASE DIAGRAM OF ONE-DIMENSIONAL t–U–J MODEL WITH ANISOTROPIC ANTIFERROMAGNETIC EXCHANGE" @default.
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• W2081005323 doi "https://doi.org/10.1142/s0217984910025127" @default.
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