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Quantum spin Hall effect in magnetic graphene

Journal Article (2025)
Author(s)

Talieh S. Ghiasi (Kavli institute of nanoscience Delft, Harvard University, TU Delft - QN/Quantum Nanoscience)

Davit Petrosyan (Student TU Delft, Kavli institute of nanoscience Delft)

Josep Ingla Aynés (Kavli institute of nanoscience Delft, TU Delft - QN/van der Zant Lab)

Tristan Bras (Kavli institute of nanoscience Delft, TU Delft - QN/van der Zant Lab)

Kenji Watanabe (National Institute for Materials Science)

Takashi Taniguchi (National Institute for Materials Science)

S. Mañas Valero (TU Delft - QN/vanderSarlab, Kavli institute of nanoscience Delft, Universidad de Valencia (ICMol))

Eugenio Coronado (Universidad de Valencia (ICMol))

H. S J van der Zant (Kavli institute of nanoscience Delft, TU Delft - QN/van der Zant Lab)

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Research Group
QN/van der Zant Lab
DOI related publication
https://doi.org/10.1038/s41467-025-60377-1
More Info
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Publication Year
2025
Language
English
Research Group
QN/van der Zant Lab
Issue number
1
Volume number
16
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Abstract

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, CrPS4. 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.