Ultrafast optical control over topological quantum states using 2-color laser pulses to manipulate electron trajectories in graphene

https://phys.org/news/2026-09-electrons-graphene-transient-topological-state.html

"Harmonic Floquet Spectroscopy: dynamic, sub-cycle optical control induces transient Floquet topological insulator state, where monolayer graphene's band structure opens topological band gaps... a 2nd harmonic pulse 2X the frequency then steers electrons, generating directional photocurrent achieving as-scale phase sensitivity over electron motion... sub-fs topologically protected optoelectronic logic processing/ lightwave-driven quantum computing"