题 目：Investigation of single molecular electronic structure by low-temperature STM
报告人：王炜华 博士
时  间：2013年4月5日(星期五)上午10:00
地  点：中心教学楼610
ABSTRACT
By scanning tunneling microscopy and spectroscopy, the electronic structures of molecules adsorbed on metal surfaces were investigated at the single-molecule level: 1. In poly-p-phenylene molecular wires, the superexchange coupling strength was characterized by measuring the energy splitting between the molecular states constructed by symmetric and antisymmetric dimerization of molecular fragments’ orbitals, and a decay constant of 0.10 ± 0.02 Å was obtained. 2. In bis-terpyridine tetra-phenyl ethylene molecules, due to the localization characteristics of the molecular orbitals, the attachment of a single Cu atom to the side terpyridine group modifies the states localized at the side group in direct contact with the Cu atom without affecting the states localized at the other parts of the molecule. 3. In a self-assembled 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.

简历：
Education
Sep. 1999- July. 2003 ，BS in Applied Physics.
Department of physics, iversity of Science and Technology of China,
Sep. 2003- Dec. 2008，Ph. D in Condensed Matter Physics 
Hefei National Laboratory for Physical Sciences at the Micro Scale, University of Science and Technology of China,
Employment
Feb. 2009- Jan. 2011，Research Assistant
Department of physics, The Hong Kong University of Science and Technology,
Feb. 2011-Dec. 2012，Research Associate
Department of physics，The Hong Kong University of Science and Technology，
Jan. 2013-，Post-doctoral Fellow
Department of physics，The Hong Kong University of Science and Technology,    
List of Journal Publications:
1. Cooperative modulation of electronic structures of aromatic molecules coupled to multiple metal contacts, W. Wang, X. Shi, S. Wang, J. Liu,   M. A. Van Hove, P. N. Liu, R.-Q Zhang, N. Lin, Phys. Rev. Lett. 110, 046802 (2013).
2. Negative Differential Resistance in a Hybrid Silicon-Molecular System: Resonance between the Intrinsic Surface-States and the Molecular Orbital, W. Wang, Y. Ji, H. Zhang, A. Zhao, B. Wang, Jinlong Yang, and J. G. Hou, ACS Nano. 6, 7066 (2012).
3. Visualization and Manipulation of Individual Dopant States in Single Conjugated Oligomers, S. Wang, W. Wang, N. Lin, ACS Nano. 6, 3404 (2012).
4*. Selective supramolecular assembly of multifunctional ligands on a Cu(111) surface: metallacycles, propeller trimers and linear chains,  W. Wang, S. Wang, Y. Hong, B. Z. Tang, N. Lin, Chem.Commun. 47, 10073 (2011).
5. Single-molecule resolution of an organometallic intermediate in a surface-supported Ullmann coupling reaction, W. Wang, X. Shi, S. Wang,   M. Van Hove, N. Lin, J. Am. Chem. Soc. 133, 13264 (2011).
6. Resolving band structure evolution and defect-induced states of single conjugated oligomers by scanning tunneling microscopy and tight-binding calculations, S. Wang, W. Wang, N. Lin, Phys. Rev. Lett. 106, 206803 (2011).
7. Vibronic state assisted resonant transport in molecules strongly anchored at an electrode, S. Wang, W. Wang, Y. Hong, B. Z. Tang, N. Lin, Phys. Rev. B. 83, 115431 (2011).
8. Manipulating Localized Molecular Orbitals by Single-Atom Contacts, W. Wang, X. Shi, C. Lin, R. Q. Zhang, C. Minot, M. Van Hove, Y. Hong, B. Z. Tang, N. Lin, Phys. Rev. Lett. 105, 126801 (2010).
9. Probing Electronic Superexchange Coupling at Isolated Poly-p-phenylene Molecules, W. Wang, S. Wang, X. Li, J.-P. Collin, J. Liu, P. N. Liu, N. Lin,  J. Am. Chem. Soc. 132, 8774 (2010).
10. Electron Stimulation of Internal Torsion of a Surface-Mounted Molecular Rotor, W. Wang, X. Shi, M. Jin, C. Minot, M. Van Hove, J-P. Collin, N. Lin, ACS Nano, 4, 4929 (2010).
12. Inspecting Metal-Coordination-Induced Perturbation of Molecular Ligand Orbitals at a Submolecular Resolution, W. Wang, Y. Hong, X. Shi, B. Z. Tang, C. Minot, M. Van Hove, N. Lin, J. Phys. Chem. Lett. 1, 2295 (2010).
11. Probing negative differential resistance on Si(111)- -Ag surface with scanning tunneling microscopy, W. Wang, A. Zhao, B. Wang and J. G. Hou, Appl. Phys. Lett. 94, 262108 (2009).
12. Controlling the Kondo effect of an adsorbed magnetic ion through its chemical bonding, A. Zhao, Q. Li, L. Chen, H. Xiang, W. Wang, S. Pan, B. Wang, X. Xiao, J. Yang, J. G. Hou and Q. Zhu, Science, 309, 1542 (2005).

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