Document Type

Journal Article

Department/Unit

Institute of Computational and Theoretical Studies

Abstract

We 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.

Publication Date

2013

Source Publication Title

Physical Review Letters

Volume

110

Start Page

046802-1

End Page

046802-5

Publisher

American Physical Society

Peer Reviewed

1

Copyright

© 2013 American Physical Society

DOI

10.1103/PhysRevLett.110.046802

Link to Publisher's Edition

http://dx.doi.org/10.1103/PhysRevLett.110.046802

ISSN (print)

00319007

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