arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1507.04827cond-mat.str-elcond-mat.supr-con
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二维t-J模型中Mott跃迁附近的光谱性质

Spectral properties near the Mott transition in the two-dimensional t-J model

Masanori Kohno

摘要:

用团簇微扰理论研究了铜氧化物高温超导体二维t-J模型在相关参数区的单粒子谱性质。在这个模型中,我们用莫特转变附近的主模解释了在铜氧化物高温超导体中观察到的各种反常现象。虽然在低能区的主导模式的行为是相似的,在二维哈伯德模型,显着的差异出现附近的莫特转变的高能量电子去除激发,可以被认为是主要来源于holon模式在一维。利用非阿贝尔动力学密度矩阵重整化群方法和团簇微扰理论相结合的方法,证实了当团簇尺寸从4 × 4增加到6 × 6时,整体光谱特征几乎保持不变.

英文摘要:

The single-particle spectral properties of the two-dimensional t-J model in the parameter regime relevant to cuprate high-temperature superconductors are investigated using cluster perturbation theory. Various anomalous features observed in cuprate high-temperature superconductors are collectively explained in terms of the dominant modes near the Mott transition in this model. Although the behavior of the dominant modes in the low-energy regime is similar to that in the two-dimensional Hubbard model, significant differences appear near the Mott transition for the high-energy electron removal excitations which can be considered to primarily originate from holon modes in one dimension. The overall spectral features are confirmed to remain almost unchanged as the cluster size is increased from 4x4 to 6x6 sites by using a combined method of the non-abelian dynamical density-matrix renormalization group method and cluster perturbation theory.

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