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Article
Cooperative modulation of electronic structures of aromatic molecules coupled to multiple metal contacts
Physical Review Letters
  • Weihua Wang, Department of Physics, The Hong Kong University of Science and Technology, Hong Kong, China
  • Xingqiang Shi, Institute of Computational and Theoretical Studies and Department of Physics, Hong Kong Baptist University, Hong Kong, China
  • Shiyong Wang, Department of Physics, The Hong Kong University of Science and Technology, Hong Kong, China
  • Jun Liu, Shanghai Key Laboratory of Functional Materials Chemistry and Institute of Fine Chemicals, East China University of Science and Technology, Meilong Road 130, Shanghai 200237, China
  • Andre Michel Van Hove, Hong Kong Baptist University
  • Pei Nian Liu, Shanghai Key Laboratory of Functional Materials Chemistry and Institute of Fine Chemicals, East China University of Science and Technology, Meilong Road 130, Shanghai 200237, China
  • Rui-Qin Zhang, Department of Physics and Materials Science, City University of Hong Kong, Hong Kong, China
  • Nian Lin, Department of Physics, The Hong Kong University of Science and Technology, Hong Kong, China
Document Type
Journal Article
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 Year
2013
Publisher
American Physical Society
Referreed
1
DOI
10.1103/PhysRevLett.110.046802
Link to Publisher’s Edition
http://dx.doi.org/10.1103/PhysRevLett.110.046802
Copyright
© 2013 American Physical Society
Citation Information
Weihua 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/