Experimental Verification of Carrier Multiplication in Graphene
| Autor: | Tobias Plötzing, Andreas Knorr, Torben Winzer, Heinrich Kurz, Daniel Neumaier, Ermin Malic |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Materials science
business.industry Graphene Mechanical Engineering Relaxation (NMR) Physics::Optics Bioengineering General Chemistry Photodetection Condensed Matter Physics law.invention Multiple exciton generation law Picosecond Excited state Optoelectronics General Materials Science Multiplication business Ultrashort pulse |
| Zdroj: | Nano Letters. 14:5371-5375 |
| ISSN: | 1530-6992 1530-6984 |
| DOI: | 10.1021/nl502114w |
| Popis: | We report on the first direct experimental observation of carrier multiplication in graphene reaching a multiplication factor of up to 2 and persisting on a picoseconds time scale. Exploiting multicolor pump-probe measurement techniques, the excited nonequilibrium carrier distribution is retrieved on an ultrafast time scale. This provides access to the temporal evolution of the optically excited carrier density and thus allows quantitative conclusions on possible carrier multiplication. Microscopic time- and momentum-resolved calculations on the ultrafast relaxation dynamics of optically excited carriers confirm the observation of carrier multiplication under corresponding experimental conditions, suggesting graphene as a promising material for novel high-efficiency photodetection devices. |
| Databáze: | OpenAIRE |
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