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The nature of the observed free-electron-like state in a PTCDA monolayer on Ag(111)

M. S. Dyer ; Mats Persson (Institutionen för teknisk fysik, Material- och ytteori)
New Journal of Physics (1367-2630). Vol. 12 (2010),
[Artikel, refereegranskad vetenskaplig]

A free-electron-like band has recently been observed in a monolayer of 3,4,9,10-perylene tetracarboxylic dianhydride (PTCDA) molecules on Ag(111) by two-photon photoemission (Schwalb et al 2008 Phys. Rev. Lett. 101 146801) and scanning tunneling spectroscopy (Temirov et al 2006 Nature 444 350). Using density functional theory calculations, we find that the observed free-electron-like band originates from the Shockley surface state band being dramatically shifted up in energy by the interaction with the adsorbed molecules, while it also acquires a substantial admixture with a molecular band.

Nyckelord: photoemission, energy

Denna post skapades 2010-08-12. Senast ändrad 2011-09-16.
CPL Pubid: 124409


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