Ultrafast Photoluminescence from Graphene

Chun Hung Lui (呂振鴻), Kin Fai Mak, Jie Shan, and Tony F. Heinz
Phys. Rev. Lett. 105, 127404 – Published 16 September 2010
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Since graphene has no band gap, photoluminescence is not expected from relaxed charge carriers. We have, however, observed significant light emission from graphene under excitation by ultrashort (30-fs) laser pulses. Light emission was found to occur across the visible spectral range (1.7–3.5 eV), with emitted photon energies exceeding that of the excitation laser (1.5 eV). The emission exhibits a nonlinear dependence on the laser fluence. In two-pulse correlation measurements, a dominant relaxation time of tens of femtoseconds is observed. A two-temperature model describing the electrons and their interaction with strongly coupled optical phonons can account for the experimental observations.

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  • Received 27 March 2010


© 2010 The American Physical Society

Authors & Affiliations

Chun Hung Lui (呂振鴻)1, Kin Fai Mak1, Jie Shan2, and Tony F. Heinz1,*

  • 1Departments of Physics and Electrical Engineering, Columbia University, 538 West 120th Street, New York, New York 10027, USA
  • 2Department of Physics, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, USA

  • *Corresponding author: tony.heinz@columbia.edu

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Vol. 105, Iss. 12 — 17 September 2010

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