3 research outputs found
Electron-phonon coupling in crystalline Pentacene films
The electron-phonon(e-p) interaction in Pentacene (Pn) films grown on Bi(001)
was investigated using photoemission spectroscopy. The spectra reveal thermal
broadening from which we determine an e-p mass enhancement factor of lambda =
0.36 +/- 0.05 and an effective Einstein energy of omega_E = 11 +/- 4 meV. From
omega_E it is inferred that dominant contributions to the e-p effects observed
in ARPES come from intermolecular vibrations. Based on the experimental data
for lambda we extract an effective Peierls coupling value of g_eff = 0.55. The
e-p coupling narrows the HOMO band width by 15 +/- 8% between 75K and 300K.Comment: 19 pages, 5 figures and supplementary informatio
Electronic decoupling of an epitaxial graphene monolayer by gold intercalation
The application of graphene in electronic devices requires large scale
epitaxial growth. The presence of the substrate, however, usually reduces the
charge carrier mobility considerably. We show that it is possible to decouple
the partially sp3-hybridized first graphitic layer formed on the Si-terminated
face of silicon carbide from the substrate by gold intercalation, leading to a
completely sp2-hybridized graphene layer with improved electronic properties.Comment: 7 pages, 4 figures, 1 tabl