论文标题
与旋转轨道耦合的相互作用的装饰蜂窝晶格中的磁性和拓扑阶段
Magnetism and topological phases in an interacting decorated honeycomb lattice with spin-orbit coupling
论文作者
论文摘要
我们在装饰的蜂窝晶格上研究了旋转轨道耦合（SOC）和库仑排斥之间的相互作用，该模型导致了很多相。虽然量子自旋大厅绝缘子在弱库仑排斥和中等SOC处保持稳定，但在广泛的库仑排斥范围内出现了半金属阶段。该半金属相具有在常规金属（例如有限的，非量化的自旋电导率）中未观察到的拓扑特性。在大型库仑排斥和可忽略的自旋轨道耦合下，电子相关性稳定了共振价键（RVB）自旋液态，与经典的抗铁磁性状态相反，均值抗铁磁性状态。在足够强的SOC下，这种RVB状态被转化为具有抗磁磁性和拓扑特征的蜂窝晶格上的S〜3/2局部矩的磁性绝缘子。
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.
