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Researchers have successfully used circularly polarized femtosecond lasers to induce a Floquet topological insulator state in solid-state graphene, achieving optical control over electron dynamics previously restricted to synthetic systems. This breakthrough demonstrates sub-cycle phase sensitivity and enables ultrafast manipulation of valley-polarized currents, marking a significant step toward practical topotronics and attosecond physics applications.

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Quantum circularly polarized light steers electrons in graphene

Quantum ZeitgeistAugust 31, 20266 min read

Researchers used intense, circularly polarized light at 1550 nm to steer electrons in graphene, creating a Floquet topological insulator and controlling its electronic properties.

Daniel M. B. Lesko, Tobias Weitz, Simon Wittigschlager, Weizhe Li, Christian Heide, Ofer Neufeld, and Peter Hommelhoff, affiliated with Friedrich-Alexander-Universität Erlangen-Nürnberg, the University of Central Florida, the Technion – Israel Institute of Technology, and the Max Planck Institute for the Structure and Dynamics of Matter, have demonstrated optical control of electrons within light-dressed graphene, a capability previously difficult to achieve in light-dressed band structures. By focusing circularly polarized femtosecond laser pulses on monolayer graphene, the team generated a Floquet topological insulator, a state of matter exhibiting unique quantum properties. They observed photocurrent circular dichroism, the all-optical anomalous Hall effect, and FTI valley-polarized currents, which could enable ultrafast…

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