Dirac semimetal is an emerging class of quantum matters, ranging from 2D category, such as, graphene and surface states of topological insulator to 3D category, for instance, Cd₃As₂ and Na₃Bi. As 3D Dirac semimetals typically possess Fermi‐arc surface states, the 2D–3D Dirac van der Waals heterostructures should be promising for future electronics. Here, graphene–Cd₃As₂ heterostructures are fabricated through direct layer‐by‐layer stacking. The electronic coupling results in a notable interlayer charge transfer, which enables us to modulate the Fermi level of graphene through Cd₃As₂. A planar graphene p–n–p junction is achieved by selective modification, which demonstrates quantized conductance plateaus. Moreover, compared with the bare graphene device, the graphene–Cd₃As₂ hybrid device presents large nonlocal signals near the Dirac point due to the charge transfer from the spin‐polarized surface states in the adjacent Cd₃As₂. The results enrich the family of van der Waals heterostructure and should inspire more studies on the application of Dirac/Weyl semimetals in spintronics.

中文翻译：

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Dirac半金属异质结构：2D石墨烯上的3D Cd3As2

狄拉克半金属是一种新兴的量子物质，其范围从2D类（例如石墨烯和拓扑绝缘体的表面状态）到3D类（例如Cd ₃ As ₂和Na ₃ Bi）。由于3D Dirac半金属通常具有费米弧形表面状态，因此2D–3D Dirac van der Waals异质结构对于未来的电子产品应该很有前途。在这里，石墨烯-Cd ₃ As ₂异质结构是通过直接逐层堆叠而制成的。电子耦合导致显着的层间电荷转移，这使我们能够通过Cd ₃ As ₂来调节石墨烯的费米能级。通过选择性修饰实现了平面石墨烯p–n–p结，这表明了量化的电导平台。此外，与裸石墨烯器件相比，由于邻近Cd ₃ As _2中自旋极化表面态的电荷转移，石墨烯-Cd ₃ As ₂杂化器件在狄拉克点附近呈现出较大的非局部信号。研究结果丰富了范德华异质结构家族，应该激发更多关于Dirac / Weyl半金属在自旋电子学中的应用的研究。