Story perspectives

Breakthrough in Valleytronics: Nonlinear Hall Effect Observed in Graphene

4/1/2026

Summary

Story summary

Researchers observed a nonlinear valley Hall effect in a graphene moiré superlattice, enabling valleytronic information processing.
The effect yields second-harmonic non-local voltages under alternating current, exceeding the previously studied linear response.
The nonlinear signal scales quadratically with driving current and quartically with local resistance.
A nonlinear inverse valley Hall effect appears via third- and fourth-harmonic non-local voltages, suggesting valley rectifier devices.

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Story summary

Researchers observed a nonlinear valley Hall effect in a graphene moiré superlattice, enabling valleytronic information processing.
The effect yields second-harmonic non-local voltages under alternating current, exceeding the previously studied linear response.
The nonlinear signal scales quadratically with driving current and quartically with local resistance.
A nonlinear inverse valley Hall effect appears via third- and fourth-harmonic non-local voltages, suggesting valley rectifier devices.