Quantum phase transition and von Neumann entropy of quasiperiodic Hubbard chains

被引：0
|
作者：
朱璇 [1 ]
童培庆 [1 ]
机构：
[1] Department of Physics, Nanjing Normal University
来源：
Chinese Physics B | 2008年 / 05期
基金：
中国国家自然科学基金;
关键词：
von Neumann entropy; quasiperiodicity; Hubbard model; spin-density waves;
D O I：
暂无
中图分类号：
O413.1 [量子力学（波动力学、矩阵力学）];
学科分类号：
070205 ; 0809 ;
摘要：
The half-filled Hubbard chains with the Fibonacci and Harper modulating site potentials are studied in a self- consistent mean-field approximation. A new order parameter is introduced to describe a charge density order. We also calculate the von Neumann entropy of the ground state. The results show that the von Neumann entropy can identify a CDW/SDW (charge density wave/spin density wave) transition for quasiperiodic models.
引用
收藏
页码：1623 / 1628
页数：6
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