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Interfacial Magnetic Order Controls Valley Polarization In Ws2/fe3gate2 Heterostructures.

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Interfacial Magnetic Order Controls Valley Polarization In Ws2/fe3gate2 Heterostructures.

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Published on: March 24, 2019

Interfacial Magnetic Order Controls Valley Polarization in WS₂/Fe₃GaTe₂ Heterostructures.

Shaofei Li¹, Xing Xie^1,2, Junying Chen^1,2

¹Institute of Quantum Physics, School of Physics, Central South University, 932 South Lushan Road, Changsha, Hunan 410083, People's Republic of China.

The Journal of Physical Chemistry Letters

|June 12, 2026

View abstract on PubMed

Summary

This summary is machine-generated.

Interfacial magnetic order in WS2/Fe3GaTe2 heterostructures controls valley exciton dynamics. Oxidation alters magnetic order, impacting magneto-valley coupling and Zeeman splitting.

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Area of Science:

Materials Science
Condensed Matter Physics
Quantum Optics

Background:

Van der Waals heterostructures combining 2D magnets and transition-metal dichalcogenides offer potential for spin and valley physics control.
The precise origin of magnetically induced valley polarization in these systems is not fully understood.

Purpose of the Study:

To investigate the role of interfacial magnetic order in governing valley exciton dynamics.
To differentiate intrinsic magnetic proximity effects from oxidation-induced interfacial reconstruction.
To elucidate the mechanisms behind magneto-valley coupling in WS2/Fe3GaTe2 heterostructures.

Main Methods:

Fabrication and characterization of bottom- and top-stacked WS2/Fe3GaTe2 heterostructures.
Polarization-resolved photoluminescence spectroscopy.

High-field magneto-optical measurements.

First-principles calculations.

Main Results:

The protected bottom-stacked interface exhibits preserved ferromagnetic order, leading to significant valley hysteresis and a large valley exciton Zeeman splitting (13.7 meV, ~59 T).
The exposed top-stacked interface shows suppressed splitting (1.26 meV) due to oxidation-induced antiferromagnetic order.
Oxidation weakens Fe-W orbital hybridization, diminishing the proximity exchange field.

Conclusions:

Interfacial magnetic reconstruction, driven by oxidation, is the critical factor determining magneto-valley coupling.
Controlling interfacial order is essential for harnessing coupled spin and valley physics in 2D heterostructures.