期刊
PHYSICAL REVIEW LETTERS
卷 105, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.127404
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资金
- National Science Foundation at Columbia [CHE-0117752]
- National Science Foundation at Case Western Reserve University [DMR-0907477]
- Air Force Office of Scientific Research
- New York State Office of Science, Technology, and Academic Research (NYSTAR)
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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