论文标题
Rashba-Hubbard模型中的磁性和金属绝缘体过渡
Magnetism and metal-insulator transitions in the Rashba-Hubbard model
论文作者
论文摘要
在凝结物理学中,金属 - 绝缘体和磁过渡的性质仍然是一个主题。在许多可能的机制中,电子相关性与自旋轨道耦合之间的相互作用是引起极大兴趣的问题,尤其是在处理准2D化合物时。鉴于此,在这里,我们使用hartree-fock方法来研究Rashba旋转轨道耦合($ v_ \ text {so} $)如何影响Hubbard交互提供的磁性顺序,即$ u $在方形晶格上。在半填充时,我们发现了增加$ v_ \ text {so} $的过渡顺序:从莫特绝缘子到金属抗fiferromagnet,然后再到顺磁性rashba金属。同样,我们的结果表明,Rashba耦合有利于掺杂方案中的磁条纹相。通过分析光谱特性,我们将磁性排序的重排与由旋转轨道耦合产生的新出现的手性相关联。我们的发现为阐明这些趋势之间的竞争提供了见解。
The nature of metal-insulator and magnetic transitions is still a subject under intense debate in condensed matter physics. Amongst the many possible mechanisms, the interplay between electronic correlations and spin-orbit couplings is an issue of a great deal of interest, in particular when dealing with quasi-2D compounds. In view of this, here we use a Hartree-Fock approach to investigate how the Rashba spin-orbit coupling, $V_\text{SO}$, affects the magnetic ordering provided by a Hubbard interaction, $U$, on a square lattice. At half-filling, we have found a sequence of transitions for increasing $V_\text{SO}$: from a Mott insulator to a metallic antiferromagnet, and then to a paramagnetic Rashba metal. Also, our results indicate that the Rashba coupling favors magnetic striped phases in the doped regime. By analyzing spectral properties, we associate the rearrangement of the magnetic ordering with the emerging chirality created by the spin-orbit coupling. Our findings provide insights towards clarifying the competition between these tendencies.