Center for Computational Quantum Physics, Flatiron Institute, New York, NY 10010, USA.
Department of Physics, Columbia University, 538 West 120th Street, New York, NY 10027, USA.
Sci Adv. 2023 Mar 15;9(11):eade7701. doi: 10.1126/sciadv.ade7701. Epub 2023 Mar 17.
We theoretically study the interplay between magnetism and a heavy Fermi liquid in the AB-stacked transition metal dichalcogenide bilayer system, MoTe/WSe, in the regime in which the layer supports localized magnetic moments coupled by interlayer electron tunneling to a weakly correlated band of itinerant electrons in the layer. We show that the interlayer electron transfer leads to a chiral Kondo exchange, with consequences including a strong dependence of the Kondo temperature on carrier concentration and anomalous Hall effect due to a topological hybridization gap. The theoretical model exhibits two phases, a small Fermi surface magnet and a large Fermi surface heavy Fermi liquid; at the mean-field level, the transition between them is first order. Our results provide concrete experimental predictions for ongoing experiments on MoTe/WSe bilayer heterostructures and introduces a controlled route to observe a topological selective Mott transition.
我们从理论上研究了 AB 堆叠过渡金属二卤族化物双层系统 MoTe/WSe 中磁性与重费米液体之间的相互作用，在该体系中， 层通过层间电子隧穿与 层中弱关联的巡游电子能带耦合，支持局域磁矩。我们表明，层间电子转移导致手征近藤交换，其结果包括：近藤温度强烈依赖于载流子浓度和由于拓扑混合能隙引起的反常 Hall 效应。该理论模型表现出两个相，小费米面磁体和大费米面重费米液体；在平均场水平，它们之间的转变是一级相变。我们的结果为正在进行的 MoTe/WSe 双层异质结构实验提供了具体的实验预测，并引入了一种观察拓扑选择性莫特转变的可控途径。
