Attosecond-fast internal photoemission
arXiv:2001.02989 · doi:10.1038/s41566-019-0580-6
Abstract
The photoelectric effect has a sister process relevant in optoelectronics called internal photoemission. Here an electron is photoemitted from a metal into a semiconductor. While the photoelectric effect takes place within less than 100 attoseconds, the attosecond time scale has so far not been measured for internal photoemission. Based on the new method CHArge transfer time MEasurement via Laser pulse duration-dependent saturation fluEnce determinatiON, CHAMELEON, we show that the atomically thin semi-metal graphene coupled to bulk silicon carbide, forming a Schottky junction, allows charge transfer times as fast as (300 200) attoseconds. These results are supported by a simple quantum mechanical model simulation. With the obtained cut-off bandwidth of 3.3 PHz for the charge transfer rate, this semimetal-semiconductor interface represents the first functional solid-state interface offering the speed and design space required for future light-wave signal processing.
References in corpus (11)
- Ultrafast Charge Transfer in Atomically Thin MoS2/WS2 Heterostructures
- Graphene Schottky diodes: an experimental review of the rectifying graphene/semiconductor heterojunction
- Ultrafast Photoluminescence from Graphene
- Snapshots of non-equilibrium Dirac carrier distributions in graphene
- Light-field driven currents in graphene
- Direct view on the ultrafast carrier dynamics in graphene
- Generation of photovoltage in graphene on a femtosecond time scale through efficient carrier heating
- Photo-thermionic effect in vertical graphene heterostructures
- Electron Thermionic Emission from Graphene and a Thermionic Energy Converter
- Theory of graphene saturable absorption
- Resolubility of Image-Potential Resonances
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