Cooperative modulation of electronic structures of aromatic molecules coupled to multiple metal contactsPhysical Review Letters
Document TypeJournal Article
AbstractWe use cryogenic scanning tunneling microscopy/spectroscopy and density-functional theory calculations to inspect the modulation of electronic states of aromatic molecules. The molecules are self-assembled on a Cu(111) surface forming molecular networks in which the molecules are in different contact configurations, including laterally-coupled to different numbers of coordination bonds and vertically-adsorbed at different heights above the substrate. We quantitatively analyze the molecular states and find that a delocalized empty molecular state is modulated by these multiple contacts in a cooperative manner: its energy is down-shifted by ~0.16 eV for each additional lateral contact and by ~0.1 eV as the vertical molecule-surface distance is reduced by 0.1 Å in the physisorption regime. We also report that in a molecule-metal-molecule system the bridging metal can mediate the electronic states of the two molecules.
PublisherAmerican Physical Society
Copyright© 2013 American Physical Society
Link to Publisher's Editionhttp://dx.doi.org/10.1103/PhysRevLett.110.046802
Citation InformationWeihua Wang, Xingqiang Shi, Shiyong Wang, Jun Liu, et al.. "Cooperative modulation of electronic structures of aromatic molecules coupled to multiple metal contacts" Physical Review Letters Vol. 110 (2013) p. 046802-1 - 046802-5 ISSN: 00319007
Available at: http://works.bepress.com/mavanhove/51/