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arXiv 0710.2591quant-ph
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冯诺伊曼熵与量子小世界网络中电子态的定域-离域跃迁

Von Neumann entropy and localization-delocalization transition of electron states in quantum small-world networks

Longyan Gong, Peiqing Tong

摘要:

数值研究了周期、无序和准周期量子小世界网络中电子的冯诺伊曼熵。对于无序QSWN,谱平均冯诺伊曼熵的导数在一定的短链密度p* 处最大,这可以作为电子态局域化离域跃迁的标志.转变点p* 与水平统计方法得到的结果一致。对于准周期QSWN,我们发现有两个区域的势参数。不同区域的电子态行为分别类似于周期量子阱和无序量子阱。

英文摘要:

The von Neumann entropy for an electron in periodic, disorder and quasiperiodic quantum small-world networks(QSWNs) are studied numerically. For the disorder QSWNs, the derivative of the spectrum averaged von Neumann entropy is maximal at a certain density of shortcut links p*, which can be as a signature of the localization delocalization transition of electron states. The transition point p* is agreement with that obtained by the level statistics method. For the quasiperiodic QSWNs, it is found that there are two regions of the potential parameter. The behaviors of electron states in different regions are similar to that of periodic and disorder QSWNs, respectively.

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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