论文标题
电子掺杂的单频Hubbard模型中强大的电荷密度波相关性
Robust charge-density wave correlations in the electron-doped single-band Hubbard model
论文作者
论文摘要
越来越多的证据表明,孔掺杂的单频哈伯德和$ t $ - $ j $型号没有反射高温铜酸盐超导体的超导基态,而是具有条纹的自旋和电荷订购的地面状态。然而,有人提出这些模型仍可能为电子掺杂材料提供有效的低能模型。在这里,我们研究了使用量子蒙特卡洛动力簇近似计算计算的电子掺杂哈伯德模型中的有限温度自旋和电荷相关性,并将其行为与相图的孔掺杂侧的行为进行对比。我们找到了与任何旋转密度调制的棋盘组和单向组件的电荷调制的证据。这些相关性与基于费米表面嵌套的弱耦合描述不一致,它们的掺杂依赖性与共振非弹性X射线散射测量有质量一致。我们的结果提供了证据,表明单频哈伯德模型描述了掺杂电子的铜层。
There is growing evidence that the hole-doped single-band Hubbard and $t$-$J$ models do not have a superconducting ground state reflective of the high-temperature cuprate superconductors but instead have striped spin- and charge-ordered ground states. Nevertheless, it is proposed that these models may still provide an effective low-energy model for electron-doped materials. Here we study the finite temperature spin and charge correlations in the electron-doped Hubbard model using quantum Monte Carlo dynamical cluster approximation calculations and contrast their behavior with those found on the hole-doped side of the phase diagram. We find evidence for a charge modulation with both checkerboard and unidirectional components decoupled from any spin-density modulations. These correlations are inconsistent with a weak-coupling description based on Fermi surface nesting, and their doping dependence agrees qualitatively with resonant inelastic x-ray scattering measurements. Our results provide evidence that the single-band Hubbard model describes the electron-doped cuprates.