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Tracing Ultrafast Separation and Coalescence of Carrier Distributions in Graphene with Time-Resolved Photoemission
- Source :
- The Journal of Physical Chemistry Letters. 3:64-68
- Publication Year :
- 2011
- Publisher :
- American Chemical Society (ACS), 2011.
-
Abstract
- Graphene, a recently discovered two-dimensional form of carbon, is a strong candidate for many future electronic devices. There is, however, still much debate over how the electronic properties of graphene behave on ultrashort time scales. Here by employing the technique of time-resolved photoemission, we obtain the evolving quantum distributions of the electrons and holes: on an ultrashort 500 fs time scale, the electron and hole populations can be described by two separate Fermi–Dirac distributions, whereas on longer time scales the populations coalesce to form a single Fermi–Dirac distribution at an elevated temperature. These studies represent the first direct measure of carrier distribution dynamics in monolayer graphene after ultrafast photoexcitation.
- Subjects :
- Coalescence (physics)
Materials science
Condensed matter physics
Graphene
Physics::Optics
chemistry.chemical_element
Angle-resolved photoemission spectroscopy
Electron
Molecular physics
law.invention
Photoexcitation
chemistry
law
General Materials Science
Physical and Theoretical Chemistry
Carbon
Quantum
Ultrashort pulse
Subjects
Details
- ISSN :
- 19487185
- Volume :
- 3
- Database :
- OpenAIRE
- Journal :
- The Journal of Physical Chemistry Letters
- Accession number :
- edsair.doi...........1169d420a4f2ad114f548697f5001fac