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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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Published in: | Journal of physics. Conference series 2019-05, Vol.1220 (1), p.12001 |
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Main Authors: | , , , , , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites |
Online Access: | Get full text |
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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. |
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ISSN: | 1742-6588 1742-6596 |
DOI: | 10.1088/1742-6596/1220/1/012001 |