Electron-hole collisions in an atomically thin semiconductor

F. Langer, C. P. Schmid, S. Schlauderer, P. Nagler, C. Schüller, T. Korn, M. Gmitra, J. Fabian, P. G. Hawkins, U. Huttner, J. T. Steiner, S. W. Koch, M. Kira, R. Huber

Research output: Contribution to journalConference articlepeer-review


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 languageEnglish (US)
Article number012001
JournalJournal of Physics: Conference Series
Issue number1
StatePublished - May 24 2019
Event12th International Conference on Excitonic and Photonic Processes in Condensed Matter and Nano Materials, EXCON 2018 - Nara City, Japan
Duration: Jul 8 2018Jul 13 2018

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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