Ghiasi Talieh S, Petrosyan Davit, Ingla-Aynés Josep, Bras Tristan, Watanabe Kenji, Taniguchi Takashi, Mañas-Valero Samuel, Coronado Eugenio, Zollner Klaus, Fabian Jaroslav, Kim Philip, van der Zant Herre S J
Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands.
Department of Physics, Harvard University, Cambridge, Massachusetts, USA.
Nat Commun. 2025 Jun 24;16(1):5336. doi: 10.1038/s41467-025-60377-1.
A promising approach to attain long-distance coherent spin propagation is accessing topological spin-polarized edge states in graphene. Achieving this without external magnetic fields necessitates engineering graphene band structure, obtainable through proximity effects in van der Waals heterostructures. In particular, proximity-induced staggered potentials and spin-orbit coupling are expected to form a topological bulk gap in graphene with gapless helical edge states that are robust against disorder. In this work, we detect the spin-polarized helical edge transport in graphene at zero external magnetic field, allowed by the proximity of an interlayer antiferromagnet, CrPS. We show the coexistence of the quantum spin Hall (QSH) states and magnetism in graphene, where the induced spin-orbit and exchange couplings also give rise to a large anomalous Hall (AH) effect. The detection of the QSH states at zero external magnetic field, together with the AH signal that persists up to room temperature, opens the route for practical applications of magnetic graphene in quantum spintronic circuitries.
一种实现长距离相干自旋传播的有前景的方法是利用石墨烯中的拓扑自旋极化边缘态。在没有外部磁场的情况下实现这一点需要对石墨烯能带结构进行工程设计，这可以通过范德华异质结构中的近邻效应来实现。特别是，近邻诱导的交错势和自旋轨道耦合有望在石墨烯中形成一个拓扑体能隙，其具有对无序具有鲁棒性的无隙螺旋边缘态。在这项工作中，我们在零外部磁场下检测到了石墨烯中自旋极化的螺旋边缘输运，这是由层间反铁磁体CrPS的近邻效应所允许的。我们展示了石墨烯中量子自旋霍尔（QSH）态和磁性的共存，其中诱导的自旋轨道和交换耦合也会产生一个大的反常霍尔（AH）效应。在零外部磁场下对QSH态的检测，以及一直持续到室温的AH信号，为磁性石墨烯在量子自旋电子电路中的实际应用开辟了道路。
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