Kavli Affiliate: Herre S. J. Van Der Zant
| First 5 Authors: Talieh S. Ghiasi, Davit Petrosyan, Josep Ingla-Aynés, Tristan Bras, Samuel Mañas-Valero
| Summary:
A promising approach to attain long-distance coherent spin propagation is
accessing quantum Hall topological spin-polarized edge states in graphene.
Achieving this without large external magnetic fields necessitates engineering
graphene band structure, obtainable through proximity to 2D magnetic materials.
In this work, we detect spin-polarized helical edge transport in graphene at
zero external magnetic field, allowed by the out-of-plane magnetic proximity of
CrPS$_4$ that spin-splits the zeroth Landau level. This zero-field detection of
the quantum anomalous spin Hall state is enabled by large induced spin-orbit
and exchange couplings in the graphene that also lead to the detection of an
enhanced Berry curvature, shifting the Landau levels, and result in an
unconventional sequence of quantum Hall plateaus. Remarkably, we observe that
the quantum anomalous Hall transport in the magnetized graphene persists up to
room temperature. The detection of spin-polarized helical edge states at zero
magnetic field and the robustness of the quantum anomalous Hall transport up to
room temperature open the route for practical applications of magnetic graphene
in quantum information processing and spintronic circuitries.
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