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Title: Dynamics of photoexcited carriers in monolayer epitaxial graphene probed by photoluminescence in the near-infrared region

We investigate the dynamics of photoexcited carriers in a single monolayer graphene at room temperature in air by femtosecond time-resolved luminescence measurements. The luminescence kinetics observed in the near-infrared region from 0.7 to 0.9 eV are analyzed based on the two-temperature model describing the cooling of thermalized carriers due to the carrier-optical-phonon coupling. The observed luminescence kinetics are well reproduced by the model, though the calculated electron temperature increases only to ∼420 K at the maximum, which is much lower than the optical phonon energies. This indicates the predominance of optical phonons over acoustic phonons in the carrier-phonon interaction even at a temperature of ∼400 K.
Authors:
 [1] ; ;  [2] ;  [3] ;  [4]
  1. Department of Applied Physics, Nagoya University, Chikusa, Nagoya 464-8603 (Japan)
  2. Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580 (Japan)
  3. Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan and Institute for Materials Chemistry and Engineering, Kyushu University, Kasuga, Fukuoka 816-8580 (Japan)
  4. Department of Applied Physics, Nagoya University, Chikusa, Nagoya 464-8603, Japan and Toyota Physical and Chemical Research Institute, Nagakute, Aichi 480-1192 (Japan)
Publication Date:
OSTI Identifier:
22261772
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1566; Journal Issue: 1; Conference: ICPS 2012: 31. international conference on the physics of semiconductors, Zurich (Switzerland), 29 Jul - 3 Aug 2012; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; COUPLING; ELECTRON TEMPERATURE; EPITAXY; GRAPHENE; INTERACTIONS; KINETICS; PHONONS; PHOTOLUMINESCENCE