Ultrafast optical-pump terahertz-probe spectroscopy of the carrier relaxation and recombination dynamics in epitaxial graphene.
By P. George, J. Strait, J. Dawlaty, S. Shivaraman, M. Chandrashekhar, Farhan Rana, M. Spencer. Nano letters (Print), 2008
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The ultrafast relaxation and recombination dynamics of photogenerated electrons and holes in epitaxial graphene are studied using optical-pump terahertz-probe spectroscopy. The conductivity in graphene at terahertz frequencies depends on the carrier concentration as well as the carrier distribution in energy. Time-resolved studies of the conductivity can therefore be used to probe the dynamics associated with carrier intraband relaxation and interband recombination. We report the electron-hole recombination times in epitaxial graphene for the first time. Our results show that carrier cooling occurs on subpicosecond time scales and that interband recombination times are carrier density dependent.
Subfields: Electrical and Electronic Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/2a965b0f09e4705c035d74d6ff9fce42444c2a92
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Citations in the corpus
- Colloquium: Graphene spectroscopy (2014, methodology): “Similar photoinduced transmission decreases have also been observed in optical pumpTHz probe measurements, where photoinduced intraband transitions always dominate (George et al., 2008; Wright et al., 2009; Strait et al., 2011).”
- Graphene Schottky diodes: an experimental review of the rectifying graphene/semiconductor heterojunction (2015, background): “2 A ) and the short lifetime of the order of picoseconds of photogenerated carriers in graphene [158]-[159] and the small effective photodetection area.”