Energy Dependence of Electron Lifetime in Graphite Observed with Femtosecond Photoemission Spectroscopy
- 15 January 1996
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 76 (3), 483-486
- https://doi.org/10.1103/PhysRevLett.76.483
Abstract
The energy dependence of the electron lifetime in graphite was measured using femtosecond time-resolved photoemission spectroscopy. The lifetime was found to be inversely proportional to the excitation energy above the Fermi level, i.e., , in sharp contrast to that of metals, whose lifetime is found to be proportional to . The results are in agreement with the prediction of the layered electron gas theory, which suggests that electron-plasmon interactions dominate the lifetime of electrons in a layered electron gas, even for small excitation energies, due to interlayer plasmon coupling.
Keywords
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