Above-barrier surface electron resonances induced by a molecular network

Rares Stiufiuc (1, 2) , Luis Perdigao (3) , B. Grandidier (1, 4) , D. Deresmes (1) , Guy Allan (1, 4) , Christophe Delerue (4, 1) , Didier Stiévenard (1) , Peter Beton (3) , Steven Erwin (5) , Michel Sassi (6) , Vincent Oison (6) , Jean-Marc Debierre (6)

1 IEMN - Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520
2 “Iuliu Hatieganu” University of Medicine and Pharmacy
3 University Park
4 PHYSIQUE - IEMN - Physique - IEMN
5 NRL - Naval Research Laboratory
6 IM2NP - Institut des Matériaux, de Microélectronique et des Nanosciences de Provence

We report the modification of the density of states of the Ag/Si(111)−√3×√3R30° surface by a self-assembled molecular network at energies much higher than the height of the potential barriers induced by the molecules. Map of the differential conductance obtained by scanning tunneling spectroscopy reveals an increase in the electron density in the pores of the network. This enhanced electronic resonance is explained by theoretical calculations where the periodic potential introduced by the molecular network causes band replica with an alteration of the surface band structure.

Domaines: Sciences de l'ingénieur [physics]

Rares Stiufiuc, Luis Perdigao, B. Grandidier, D. Deresmes, Guy Allan, et al.. Above-barrier surface electron resonances induced by a molecular network. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2010, 81, pp.045421-1-5. ⟨10.1103/PhysRevB.81.045421⟩. ⟨hal-00549037⟩