Ultrafast Photoluminescence from Graphene

Details Ultrafast Photoluminescence from Graphene Ultrafast Photoluminescence from Graphene

2010-06-30

arxiv.org/abs/1006.5769v1

Physical Review Letters 105, 127404 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, 7 figures, supplemental material included

Scientific paper

10.1103/PhysRevLett.105.127404

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 of the time-domain response, 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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