Strong-field biasing of a solid with intense lightwaves leads to simultaneous interband excitation and intraband acceleration of electron-hole pairs. These coupled dynamics result in high-harmonic emission from the bulk solid. For a controlled acceleration of quasiparticles with well-defined initial conditions, we prepare coherent electron-hole pairs by a resonant near - infrared pulse before a strong multi-terahertz field accelerates these entities. The ballistic dynamics manifests itself as high-order sidebands to the near-infrared excitation spectrum. This mechanism allows for the implementation of a quasiparticle collider in order to study those entities in close analogy to conventional collision experiments. Accelerating electrons and holes in a monolayer of a transition metal dichalcogenide extends this scheme to internal quantum degrees of freedom. We show how a strong lightwave can transport electron-hole pairs from one valley to the other faster than one oscillation of the carrier wave, effectively switching the valley pseudospin on a sub-cycle scale. This scheme paves the way to ultimately fast valleytronics.
|Original language||English (US)|
|Journal||Journal of Physics: Conference Series|
|Publication status||Published - May 24 2019|
|Event||12th International Conference on Excitonic and Photonic Processes in Condensed Matter and Nano Materials, EXCON 2018 - Nara City, Japan|
Duration: Jul 8 2018 → Jul 13 2018
ASJC Scopus subject areas
- Physics and Astronomy(all)