论文标题
配对的结合和增强不对称哈伯德梯子中的配对相关性
Pair binding and enhancement of pairing correlations in asymmetric Hubbard ladders
论文作者
论文摘要
使用密度矩阵重新归一化的组方法和精确的对角线化研究了每条腿上具有不同现场交互$ u_y $ and Hoppings $ u_y $ and Hoppings $ t_y $的非对称双腿哈伯德梯子。在对称梯子中发现的配对与引入腿不对称的引入非常强大。在研究配对时，与较高尺寸系统的sublattices相比，一频哈伯德梯子模型被更好地描述为一维相关的两波段模型。不对称的哈伯德阶梯为我们提供了一个简单的模型，用于研究电荷传递和Mott绝缘子之间的跨界型配对。
Asymmetric two-leg Hubbard ladders with different on-site interactions $U_y$ and hoppings $t_y$ on each leg are investigated using the density matrix renormalization group method and exact diagonalizations. The pairing found in symmetric ladders is robust against the introduction of the leg asymmetry. When studying pairing, one-band Hubbard ladder models are better described as one-dimensional correlated two-band models than as sublattices of higher dimensional systems. The asymmetric Hubbard ladder provides us with a simple model for studying pairing in the crossover regime between charge transfer and Mott insulators.
