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arXiv 1003.4939cond-mat.str-el
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一维准晶中的电子配对

Electron pairing in one-dimensional quasicrystals

Y. Arredondo, O. Navarro

摘要:

本文用密度矩阵重整化群方法研究了一维二元Hubbard链在不同带填充值下的电子配对。该系统由具有两种在位相关性的线性点阵组成,在位相关性由两种势定义:U_A吸引(< 0),U_B排斥(> 0).系统的原子能级被周期性和准周期性排序调制,在后一种情况下遵循斐波那契序列。我们分析了这种调制的效果,并计算了电子配对相图作为带填充的函数。发现存在一个带填充的临界值,在这个临界值处,周期链和Fibonacci二元Hubbard链的行为是相反的。

英文摘要:

Electron pairing in one-dimensional binary Hubbard chains is studied for different values of the band-filling using the Density Matrix Renormalization Group method. The systems consist of linear arrays of sites with two types of on-site correlations defined by two potentials: U_A being attractive (< 0), and U_B repulsive (> 0). The atomic levels of the system are modulated with periodic and quasiperiodic ordering, in the latter case following the Fibonacci sequence. We analyze the effect of such modulations and calculate the electron pairing phase diagram as a function of the band-filling. It is observed that there is a critical value of the band-filling where the behavior of the periodic and the Fibonacci binary Hubbard chains is reversed.

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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