Electron-phonon coupling spectrum in photodoped pentacene crystals.
The coupling between conduction charges and the vibrational modes of the molecular lattice plays a defining role in the transport characteristics of organic semiconductors. Using electron tunneling spectroscopy, we obtain the electron--optical-phonon coupling spectrum in photodoped pentacene crystals at energies <30 meV. Comparison of the tunneling spectrum to infrared absorption data on the optical phonon density of states yields the energy dependence of the electron-phonon scattering matrix element. The integrated spectral weight of the electron-phonon coupling shows that superconductivity in pentacene is likely of electron-phonon origin.
Lee
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Bell Laboratories-Lucent Technologies, 600 Mountain Avenue, Murray Hill, New Jersey 07974, USA. markl@lucent.com
Schön
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Kloc
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Batlogg
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