Quantum Monte Carlo study of the pairing correlation in the Hubbard ladder.
Quantum Monte Carlo study of the pairing correlation in the Hubbard ladder.
复制标题
哈伯德阶梯中配对相关性的量子蒙特卡罗研究。
DOI：
10.1103/physrevb.54.r15641
复制
发表时间：
1996
期刊：
影响因子：
--
通讯作者：
Aoki
中科院分区：
文献类型：
--
作者：
Kuroki;Kimura;Aoki
对两腿Hubbard阶梯模型进行了广泛的量子Monte Carlo计算，以澄清单重态配对关联是否缓慢衰减，这是从弱耦合理论预测的，但在数值研究中有争议。我们的结果表明，有限系统中能级的离散性极大地影响了关联，如果我们使成键带和反键带的能级在费米能级上相互靠近以模拟热力学极限，确实可以检测到增强的配对关联。
An extensive Quantum Monte Carlo calculation is performed for the two-leg Hubbard ladder model to clarify whether the singlet pairing correlation decays slowly, which is predicted from the weak-coupling theory but controversial from numerical studies. Our result suggests that the discreteness of energy levels in finite systems affects the correlation enormously, where the enhanced pairing correlation is indeed detected if we make the energy levels of the bonding and anti-bonding bands lie close to each other at the Fermi level to mimic the thermodynamic limit.