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高铜酸盐超导体正常态中条纹的涨落的数值证据。

Numerical evidence of fluctuating stripes in the normal state of high- cuprate superconductors.

机构信息

Department of Physics, Stanford University, Stanford, CA 94305, USA.

Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, Menlo Park, CA 94025, USA.

出版信息

Science. 2017 Dec 1;358(6367):1161-1164. doi: 10.1126/science.aak9546.

Abstract

Upon doping, Mott insulators often exhibit symmetry breaking where charge carriers and their spins organize into patterns known as stripes. For high-transition temperature cuprate superconductors, stripes are widely suspected to exist in a fluctuating form. We used numerically exact determinant quantum Monte Carlo calculations to demonstrate dynamical stripe correlations in the three-band Hubbard model, which represents the local electronic structure of the copper-oxygen plane. Our results, which are robust to varying parameters, cluster size, and boundary conditions, support the interpretation of experimental observations such as the hourglass magnetic dispersion and the Yamada plot of incommensurability versus doping in terms of the physics of fluctuating stripes. These findings provide a different perspective on the intertwined orders emerging from the cuprates' normal state.

摘要

掺杂后,莫特绝缘体通常表现出对称破缺,载流子及其自旋组织成称为条纹的模式。对于高温超导铜酸盐,条纹广泛被怀疑以波动的形式存在。我们使用数值精确的行列式量子蒙特卡罗计算,在代表铜-氧面局域电子结构的三能带 Hubbard 模型中,展示了动态条纹关联。我们的结果对变化的参数、团簇大小和边界条件具有鲁棒性,支持了实验观测的解释,例如沙漏磁色散和非调掺杂的 Yamada 图,这些都可以用波动条纹的物理来解释。这些发现为铜酸盐正常态中出现的交织有序提供了一个不同的视角。

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