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arXiv 2605.09705cond-mat.str-el
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两腿t-J链中的自旋电荷分离

Spin-charge separation in two-leg t-J ladders

University of Tennessee, Knoxville(田纳西大学诺克斯维尔分校);Oak Ridge National Laboratory(橡树岭国家实验室)

Luhang Yang, Elbio Dagotto

AI总结:

研究通过DMRG方法探讨两腿t-J链中自旋电荷分离现象,分析自旋交换、空穴掺杂等因素对系统相变的影响,揭示自旋-电荷分离在更宽泛链式结构中的持续性。

摘要:

自旋电荷分离是一维费米系统的重要特征,但在更高维度中的实现仍是一个开放问题。为解决此问题,我们利用密度矩阵重整化群(DMRG)方法及其时间依赖扩展,研究两腿t-J链的基态关联和单粒子移除能谱。通过分析plaquette对角跃迁、自旋交换和空穴掺杂的影响,我们系统地探讨了系统从已知的Luther-Emery相(有间隙自旋和无间隙电荷模式)转变为Luttinger液体相(无间隙自旋和电荷激发)的过程。结合先前使用精确对角化研究的结果,我们的结果提供了证据表明,自旋电荷分离可能在更宽泛的链式结构中持续存在。

英文摘要:

Spin-charge separation is a hallmark of one-dimensional fermionic systems, yet its realization in higher dimensions remains an open question. To address this issue, we investigate a two-leg t-J ladder using the density matrix renormalization group (DMRG) method and its time-dependent extension. By analyzing ground-state correlations and single-particle removal spectra, we systematically examine the effects of plaquette diagonal hopping, spin exchange, and hole doping. Within appropriate parameter regimes, these factors drive the system from the well-known Luther Emery phase, with gapped spin and gapless charge modes, into a Luttinger liquid phase characterized by gapless spin and charge excitations, where signatures of spin-charge separation emerge. In combination with previous studies using exact diagonalization, our results provide evidence that spin-charge separation may persist in wider ladder systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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