Ultrafast band-gap renormalization and build-up of optical gain in monolayer MoTe2
| Autor: | Jerry V. Moloney, Tineke Stroucken, J. T. Steiner, U. Huttner, Lars Meckbach, Stephan W. Koch, Jörg Hader, Josefine Neuhaus |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Condensed Matter - Materials Science Condensed Matter - Mesoscale and Nanoscale Physics Phonon Scattering Exciton Relaxation (NMR) Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology Coupling (probability) 01 natural sciences Molecular physics Resonance (particle physics) Condensed Matter::Materials Science Excited state Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences 010306 general physics 0210 nano-technology Ultrashort pulse |
| Zdroj: | Physical Review B. 101 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | The dynamics of band-gap renormalization and gain build-up in monolayer MoTe$_2$ is investigated by evaluating the non-equilibrium Dirac-Bloch equations with the incoherent carrier-carrier and carrier-phonon scattering treated via quantum-Boltzmann type scattering equations. For the case where an approximately $300$ fs-long high intensity optical pulse generates charge-carrier densities in the gain regime, the strong Coulomb coupling leads to a relaxation of excited carriers on a few fs time scale. The pump-pulse generation of excited carriers induces a large band-gap renormalization during the time scale of the pulse. Efficient phonon coupling leads to a subsequent carrier thermalization within a few ps, which defines the time scale for the optical gain build-up energetically close to the low-density exciton resonance. This is a post-peer-review version of an article published in Physical Review B |
| Databáze: | OpenAIRE |
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