论文标题
两腿方形圆柱体上的掺杂三频哈伯德模型中的配对密度波
Pair density wave in doped three-band Hubbard model on two-leg square cylinders
论文作者
论文摘要
一对密度波（PDW）是具有空间调制阶参数的超导（SC）状态。尽管对PDW状态的性质知之甚少，但其在具有不同敏感性的微观模型中的实现一直具有挑战性。在这里，我们报告了长的两腿平方缸上的三频哈伯德模型（也称为emery模型）的密度 - 矩阵重新归一化组研究。在光掺杂时，我们发现系统的基态与具有相应和幂律SC，电荷（CDW）和自旋（SDW）密度波相关的PDW状态相一致。 SC相关性在与D-Wave配对对称性的相邻CU位点之间占主导地位。有趣的是，我们发现，近邻居的相互作用，尤其是近邻居的$ v_ {pd} $相互作用之间的相互作用，可以显着增强SC相关性，同时抑制CDW相关性。对于适度强的有吸引力的$ v_ {pd} $，SC相关性变成了准长的PDW敏感性。
A pair density wave (PDW) is a superconducting (SC) state with spatially modulated order parameter. Although much is known about the properties of the PDW state, its realization in microscopic models with divergent susceptibility has been challenging. Here we report a density-matrix renormalization group study of a three-band Hubbard model (also known as the Emery model) for cuprates on long two-leg square cylinders. Upon light doping, we find that the ground state of the system is consistent with that of a PDW state with mutually commensurate and power-law SC, charge (CDW) and spin (SDW) density wave correlations. The SC correlations are dominant between neighboring Cu sites with d-wave pairing symmetry. Interestingly, we find that the near-neighbor interactions, especially the near-neighbor attractive $V_{pd}$ interaction between neighboring Cu and oxygen sites, can notably enhance the SC correlations while simultaneously suppressing the CDW correlations. For a modestly strong attractive $V_{pd}$, the SC correlations become quasi-long-ranged with a divergent PDW susceptibility.
