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Related Experiment Video

Updated: Sep 18, 2025

Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials

Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials

Published on: January 21, 2016

Quantum spin Hall effect in magnetic graphene.

Talieh S Ghiasi^1,2, Davit Petrosyan³, Josep Ingla-Aynés³

¹Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands. t.s.ghiasi@tudelft.nl.

Nature Communications

|June 24, 2025

Summary

This summary is machine-generated.

We demonstrate spin-polarized helical edge transport in graphene at zero magnetic field using CrPS₄. This breakthrough enables robust quantum spin Hall states and magnetism, paving the way for spintronic devices.

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Area of Science:

Condensed Matter Physics
Materials Science
Spintronics

Background:

Long-distance coherent spin propagation is crucial for spintronics.
Topological spin-polarized edge states in graphene offer a promising route.
Engineering graphene's band structure via van der Waals heterostructures is key for achieving these states without external magnetic fields.

Purpose of the Study:

To detect spin-polarized helical edge transport in graphene at zero external magnetic field.
To investigate the coexistence of quantum spin Hall (QSH) states and magnetism in graphene.
To explore the potential for practical applications in quantum spintronic circuitries.

Main Methods:

Utilizing van der Waals heterostructures with an interlayer antiferromagnet, CrPS₄, to induce proximity effects in graphene.
Engineering graphene's band structure to create a topological bulk gap with gapless helical edge states.
Experimental detection of spin-polarized helical edge transport and anomalous Hall (AH) effect.

Main Results:

Successful detection of spin-polarized helical edge transport in graphene at zero external magnetic field.
Demonstration of the coexistence of quantum spin Hall (QSH) states and magnetism in graphene.
Observation of a large anomalous Hall (AH) effect due to induced spin-orbit and exchange couplings, persisting up to room temperature.

Conclusions:

The proximity of CrPS₄ enables the formation of QSH states in graphene without external magnetic fields.
The observed QSH states and room-temperature AH effect in magnetic graphene open avenues for spintronic applications.
This work provides a pathway for developing practical quantum spintronic circuitries based on engineered magnetic graphene.