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

Takeshi Koyama, Yoshito Ito, Kazuma Yoshida, Hiroki Ago, Arao Nakamura

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    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.

    Original languageEnglish
    Title of host publicationPhysics of Semiconductors - Proceedings of the 31st International Conference on the Physics of Semiconductors, ICPS 2012
    PublisherAmerican Institute of Physics Inc.
    Pages167-168
    Number of pages2
    ISBN (Print)9780735411944
    DOIs
    Publication statusPublished - 2013
    Event31st International Conference on the Physics of Semiconductors, ICPS 2012 - Zurich, Switzerland
    Duration: Jul 29 2012Aug 3 2012

    Publication series

    NameAIP Conference Proceedings
    Volume1566
    ISSN (Print)0094-243X
    ISSN (Electronic)1551-7616

    Other

    Other31st International Conference on the Physics of Semiconductors, ICPS 2012
    Country/TerritorySwitzerland
    CityZurich
    Period7/29/128/3/12

    All Science Journal Classification (ASJC) codes

    • Physics and Astronomy(all)

    Fingerprint

    Dive into the research topics of 'Dynamics of photoexcited carriers in monolayer epitaxial graphene probed by photoluminescence in the near-infrared region'. Together they form a unique fingerprint.

    Cite this