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Optical control over topological Chern number in moiré materials
O Huber1, K Kuhlbrodt1, E Anderson2
1Institute for Quantum Electronics, ETH Zürich, Zürich, Switzerland.
Nature
|January 28, 2026
Summary
Researchers demonstrate optical switching of spin-valley properties in twisted MoTe2 (t-MoTe2) homobilayers. This breakthrough allows dynamic control of ferromagnetic states and topological order using light, opening doors for quantum circuits.
Area of Science:
- Quantum Matter Physics
- Condensed Matter Physics
- Materials Science
Background:
- Optical control of quantum matter offers dynamic tuning of properties like band topology and superconductivity.
- Achieving steady-state optical control in strongly correlated electron systems remains a challenge.
Purpose of the Study:
- To demonstrate optical switching of the spin-valley degree of freedom in twisted MoTe2 (t-MoTe2) homobilayers.
- To investigate the dynamic control of strongly correlated phases, including Chern insulators and ferromagnetic metals.
Main Methods:
- Utilized twisted MoTe2 (t-MoTe2) homobilayers with flat valley-contrasting Chern bands.
- Employed resonant excitation of exciton-polaron transitions with circularly polarized light.
Main Results:
- Successfully demonstrated optical switching of the spin-valley orientation in various strongly correlated phases.
- Showcased dynamic reversal of ferromagnetic spin states without an external magnetic field.
- Provided evidence for dynamical control over a topological order parameter.
Conclusions:
- Non-thermal optical switching of ferromagnetic spin states is achievable.
- Dynamical control of topological order parameters is possible, enabling new quantum technologies.
- Paved the way for optical generation of chiral edge modes and topological quantum circuits.
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