Researchers demonstrate all-optical switching of spin–valley ferromagnetism in twisted MoTe₂
Researchers from ETH Zürich, University of Washington, University of Basel and National Institute for Materials Science have demonstrated all-optical control over the spin-valley polarization in twisted molybdenum ditelluride (t‑MoTe₂) homobilayers – a step toward dynamically reconfigurable quantum materials and optically defined topological circuits. The work shows how circularly polarized light can reversibly switch the magnetic orientation of a strongly correlated ferromagnetic state, all without changing the sample temperature.
The experiments, led by Prof. Ataç Imamoğlu (ETH Zürich), Prof. Tomasz Smoleński (University of Basel), and colleagues, exploit a system where two atomically thin MoTe₂ layers are stacked with a small twist angle. This twist creates a moiré superlattice with flat, valley‑contrasting Chern bands, giving rise to highly correlated quantum phases – including Chern insulators and ferromagnetic metals – depending on the electron filling. Because the electronic bands are nearly dispersionless, electron-electron interactions dominate, resulting in spontaneous spin alignment even at cryogenic but steady temperatures.
Source: https://www.spintronics-info.com/researchers-demonstrate-all-optical-switching-spin-valley-ferromagnetism
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