We demonstrate that the electron density of the light-populated image potential states in graphite reaches its maximum when the photon energy of ultrashort laser pulses is resonant with the π−π* band gap at the M point of the Brillouin zone. This unexpected behavior, as shown by the nonlinear photoelectron spectroscopy data, is assisted by the onset of a strong light-induced interaction between the π bands and the image potential states. This finding suggests the possibility of exploring new photochemical processes at the graphite surface and related compounds.
Pagliara, S., Montagnese, M., Dal Conte, S., Galimberti, G., Ferrini, G., Parmigiani, F., Insight on the interaction between image potential state and π bands in graphite, <<PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS>>, 2013; 87 (Gennaio): 045427-045432. [doi:10.1103/PhysRevB.87.045427] [http://hdl.handle.net/10807/42084]
Insight on the interaction between image potential state and π bands in graphite
Pagliara, Stefania;Montagnese, Matteo;Dal Conte, Stefano;Galimberti, Gianluca;Ferrini, Gabriele;
2013
Abstract
We demonstrate that the electron density of the light-populated image potential states in graphite reaches its maximum when the photon energy of ultrashort laser pulses is resonant with the π−π* band gap at the M point of the Brillouin zone. This unexpected behavior, as shown by the nonlinear photoelectron spectroscopy data, is assisted by the onset of a strong light-induced interaction between the π bands and the image potential states. This finding suggests the possibility of exploring new photochemical processes at the graphite surface and related compounds.
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