论文标题
在范德华界面的NBSE2中自发自旋谷化极化
Spontaneous spin-valley polarization in NbSe2 at a van der Waals interface
论文作者
论文摘要
范德华（VDW）界面处的接近效应可创建出现的量子电子基态。在这里，我们证明了最初具有二维（2D）NBSE2的最初使用的二维（2D）NBSE2形成了具有2D Ferromagnet V5SE8的VDW界面处的自动自旋极化。我们研究了NBSE2/V5SE8磁VDW异质结构的异常霍尔效应（AHE），并发现随着V5SE8层的数量变细至单层极限，AHE的符号被逆转。有趣的是，这些样品的AHE信号通过平面磁场增强了，这表明除了磁化以外，对AHE信号的额外贡献。这种异常的行为通过频带结构计算很好地再现，在2D NBSE2中，浆果曲率的出现沿2D NBSE2中的自旋分级淋巴结线的出现，平面磁化强度在非磁性型和Zeeman-type Spin-Ortaction之间在非含量2D量子中揭示了磁性型和Zeeman型自旋相互作用之间的独特相互作用。
A proximity effect at a van der Waals (vdW) interface enables creation of an emergent quantum electronic ground state. Here we demonstrate that an originally-superconducting two-dimensional (2D) NbSe2 forms a ferromagnetic ground state with spontaneous spin polarization at a vdW interface with a 2D ferromagnet V5Se8. We investigated the anomalous Hall effect (AHE) of the NbSe2/V5Se8 magnetic vdW heterostructures, and found that the sign of the AHE was reversed as the number of the V5Se8 layer was thinned down to the monolayer limit. Interestingly, the AHE signal of those samples was enhanced with the in-plane magnetic fields, suggesting an additional contribution to the AHE signal other than magnetization. This unusual behavior is well reproduced by band structure calculations, where the emergence of the Berry curvature along the spin-degenerate nodal lines in 2D NbSe2 by the in-plane magnetization plays a key role, unveiling a unique interplay between magnetism and Zeeman-type spin-orbit interaction in a non-centrosymmetric 2D quantum material.
