有机导体中各向异性狄拉克锥重塑和亚铁磁自旋极化的观测
Observation of an anisotropic Dirac cone reshaping and ferrimagnetic spin polarization in an organic conductor
摘要：
石墨烯中无质量狄拉克费米子之间的库仑相互作用在各向同性狄拉克点周围是无屏蔽的，导致对数速度重整化和锥重塑。在对称性较低的狄拉克材料中，具有倾斜轴的各向异性锥，库仑相互作用可以提供更多的奇异现象，这些现象尚未在实验中发现。在这里，使用选址核磁共振，我们发现一个不均匀的锥重塑伴随着带宽减少和出现亚铁磁性的倾斜狄拉克锥上的电荷排序的边缘在有机化合物。基于重整化群方法和哈伯德模型的理论分析表明，这些观测结果分别是库仑相互作用的长程和短程部分的直接结果。锥重塑和带宽重整化，以及这里揭示的新的磁性，可以是普遍存在的，对许多狄拉克材料至关重要。
英文摘要：
The Coulomb interaction among massless Dirac fermions in graphene is unscreened around the isotropic Dirac points, causing a logarithmic velocity renormalization and a cone reshaping. In less symmetric Dirac materials possessing anisotropic cones with tilted axes, the Coulomb interaction can provide still more exotic phenomena which have not been experimentally unveiled yet. Here, using site-selective nuclear magnetic resonance, we find a non-uniform cone reshaping accompanied by a bandwidth reduction and an emergent ferrimagnetism in tilted Dirac cones that appear on the verge of charge ordering in an organic compound. Our theoretical analyses based on the renormalization-group approach and the Hubbard model show that these observations are the direct consequences of the long-range and short-range parts of the Coulomb interaction, respectively. The cone reshaping and the bandwidth renormalization, as well as the novel magnetism revealed here, can be ubiquitous and vital for many Dirac materials.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
