Inducement of bond-order wave due to electron correlation in one dimension
Inducement of bond-order wave due to electron correlation in one dimension
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DOI：
10.1103/physrevb.67.205109
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发表时间：
2003-05
影响因子：
3.7
通讯作者：
Yao-Z Zhang;Chang-qin Wu;Hai-Qing Lin
中科院分区：
文献类型：
--
作者：
Yao-Z Zhang;Chang-qin Wu;Hai-Qing Lin
利用密度矩阵重整化群方法研究了在位能量为Δ的Hubbard链在半填充时的量子相变.我们的研究结果支持存在一个键序波相，它将带绝缘体从莫特绝缘体，即使在没有电子-声子耦合。在固定的交错电位下精确地确定了临界点。我们的结果表明，一个较小的尺寸的键级波相位比以前的结果。
Density-matrix renormalization-group methods are used to investigate the quantum phase transitions in a Hubbard chain with an alternating on-site energy Δ at half filling. Our results support the existence of a bond-orderwave phase, which separates the band insulator from the Mott insulator even in the absence of electron-phonon coupling. The critical points are determined accurately at fixed staggered potentials. Our results indicate a slightly smaller size of the bond-order wave phase than that of previous results.