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Electron-hole collisions in an atomically thin semiconductor

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...

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Bibliographic Details
Published in:Journal of physics. Conference series 2019-05, Vol.1220 (1), p.12001
Main Authors: Langer, F, Schmid, C P, Schlauderer, S, Nagler, P, Schüller, C, Korn, T, Gmitra, M, Fabian, J, Hawkins, P G, Huttner, U, Steiner, J T, Koch, S W, Kira, M, Huber, R
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Language:English
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Summary: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.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1220/1/012001