论文标题
带有π-flux Dirac Triplon的二维制造式距离模型的负热大厅电导
Negative Thermal Hall Conductance in Two-Dimer Shastry-Sutherland Model with π-flux Dirac Triplon
论文作者
论文摘要
我们引入了一种有效的2二维紧密结合模型，用于具有几何可调的三倍激励家族的家族。由倾斜的外部磁场诱导的Rashba伪源性轨道耦合导致具有具有π-莓通量的非平凡拓扑特性的基本激发。因此，面内和平面磁场之间的相互作用使我们能够有效地设计该骨孔系统中的频带结构。特别是，平面磁场会导致三倍带底部附近的浆果曲率热点，同时大大增加了拓扑三位链带的临界磁场。我们明确计算了SRCU2（BO3）2中三位圆柱效应的实验特征，并在可访问的参数范围内显示出明显且可调的传输信号，尤其是随着热厅电导符号的变化。倾斜的磁场也可用于减少最低三位带的带宽。因此，我们证明它可以成为相关的骨拓扑系统的灵活的理论和实验平台。
We introduce an effective 2-dimer tight-binding model for the family of Shastry-Sutherland models with geometrically tunable triplon excitations. The Rashba pseudospin-orbit coupling induced by the tilted external magnetic field leads to elementary excitations having nontrivial topological properties with π-Berry flux. The interplay between the in-plane and out-of-plane magnetic field thus allows us to effectively engineer the band structure in this bosonic system. In particular, the in-plane magnetic field gives rise to Berry curvature hotspot near the bottom of the triplon band, and at the same time significantly increases the critical magnetic field for the topological triplon band. We calculate explicitly the experimental signature of the thermal Hall effect of triplons in SrCu2(BO3)2, and show a pronounced and tunabled transport signals within the accessible parameter range, particularly with a change of sign of the thermal Hall conductance. The tilted magnetic field is also useful in reducing the bandwidth of the lowest triplon band. We show it can thus be a flexible theoretical and experimental platform for the correlated bosonic topological system.
