论文标题
通过键拉伸的氧气声子抑制铜矿中的甲基互动相互作用
Suppressed superexchange interactions in the cuprates by bond-stretching oxygen phonons
论文作者
论文摘要
我们使用精确的对角线化和确切的量子量子蒙特卡洛方法研究了在绝热和非绝热限制中的一维（1D）角共享蛋糕的多轨哈伯德 - su-schrieffer-heeger模型。我们的结果表明，只能在半填充时略低于关键耦合$ g_c $的狭窄耦合范围内实现晶格二聚化。除了这种关键的耦合之外，有效跳变的迹象以及晶格变得不稳定。我们还检查了该模型的温度依赖性均匀磁化易感性和动力学磁化率，并将它们与有效自旋$ 1/2 $ HEISENBERG模型进行了比较。在此过程中，我们从数值上证明了$ e $ -ph相互作用引起的晶格波动抑制了有效的superexchange相互作用。我们的结果阐明了键拉伸语音子在父基酸酯化合物中的影响，并且与一维库酸盐尤其相关，在最近推断出强大的$ e $ ph相互作用的情况下。
We study a multi-orbital Hubbard--Su-Schrieffer-Heeger model for the one-dimensional (1D) corner-shared cuprates in the adiabatic and nonadiabatic limits using the exact diagonalization and determinant quantum Monte Carlo methods. Our results demonstrate that lattice dimerization can be achieved only over a narrow range of couplings slightly below a critical coupling $g_c$ at half-filling. Beyond this critical coupling, the sign of the effective hopping changes, and the lattice becomes unstable. We also examine the model's temperature-dependent uniform magnetic susceptibility and the dynamical magnetic susceptibility and compare them to the results of an effective spin-$1/2$ Heisenberg model. In doing so, we numerically demonstrate that the lattice fluctuation induced by the $e$-ph interaction suppresses the effective superexchange interaction. Our results elucidate the effect of bond-stretching phonons in the parent cuprate compounds in general and are particularly relevant to 1D cuprates, where strong $e$-ph interactions have recently been inferred.
