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arXiv 2005.10776cond-mat.str-el
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具有自旋轨道耦合的相互作用修饰蜂窝晶格中的磁性和拓扑相

Magnetism and topological phases in an interacting decorated honeycomb lattice with spin-orbit coupling

Manuel Fernandez Lopez, Jaime Merino

摘要:

本文研究了蜂窝晶格上的哈伯德模型中自旋轨道耦合与库仑排斥的相互作用。虽然量子自旋霍尔绝缘体在弱库仑排斥和中等SOC下是稳定的,但在大范围的库仑排斥中,在大SOC下出现半金属相。这种半金属相具有在常规金属中未观察到的拓扑性质,例如有限的、非量子化的自旋霍尔电导率。在大的库仑排斥和可忽略的自旋轨道耦合,电子关联稳定的共振价键(RVB)自旋液体状态相比,经典的反铁磁状态预测的平均场论。在足够强的SOC下,这种RVB态转变为具有反铁磁序和拓扑特征的蜂窝晶格上的由S3/2局域矩组成的磁绝缘体。

英文摘要:

We study the interplay between spin-orbit coupling (SOC) and Coulomb repulsion in a Hubbard model on a decorated honeycomb lattice which leads to a plethora of phases. While a quantum spin hall insulator is stable at weak Coulomb repulsion and moderate SOC, a semimetallic phase emerges at large SOC in a broad range of Coulomb repulsion. This semimetallic phase has topological properties not observed in conventional metals such as a finite, non-quantized spin Hall conductivity. At large Coulomb repulsion and negligible spin-orbit coupling, electronic correlations stabilize a resonance valence bond (RVB) spin liquid state in contrast to the classical antiferromagnetic state predicted by mean-field theory. Under sufficiently strong SOC, such RVB state is transformed into a magnetic insulator consisting on S~3/2 localized moments on a honeycomb lattice with antiferromagnetic order and topological features.

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。

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