Spin-orbit–driven ferromagnetism at half moiré filling in magic-angle twisted bilayer graphene

• DOI: 10.1126/science.abh2889
• Publication Date: 2022-01-06T18:58:12Z
• Authors: Jiang-Xiazi Lin; Ya-Hui Zhang; Erin Morissette; Zhi Wang; Song Liu; Daniel Rhodes; K. Watanabe; T. Taniguchi; James Hone; J. I. A. Li
• Keywords: Bilayer graphene; Magic angle

Strong electron correlation and spin-orbit coupling (SOC) can have a profound influence on the electronic properties of materials. We examine their combined 2-dimensional system at atomic interface between magic-angle twisted bilayer graphene tungsten diselenide crystal. within moiré flatband stabilizes correlated insulating states both quarter half filling, SOC transforms these Mott-like insulators into ferromagnets, evidenced by robust anomalous Hall effect with hysteretic switching behavior. The spin valley degrees freedom is demonstrated through control magnetic order an in-plane field, or perpendicular electric field. Our findings establish experimental knob to engineer topological bands in related systems.