| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Scanning Tunneling Spectroscopy of Metal Phthalocyanines on a Au(111) Surface with a Ni Tip |
| JIA Zhi-Chun, HU Zhen-Peng, ZHAO Ai-Di, LI Zhen-Yu, LI Bin**
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Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026
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| Cite this article: |
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JIA Zhi-Chun, HU Zhen-Peng, ZHAO Ai-Di et al 2011 Chin. Phys. Lett. 28 076802 |
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Abstract Scanning tunneling spectroscopy of metal phthalocyanines (MPc) adsorbed on a Au(111) surface with a Ni(111) scanning tunneling microscopy tip is simulated on the basis of first-principles calculations and a modified Bardeen approximation. Local d orbital symmetry matching between the molecule and the Ni tip brings obvious negative differential resistance (NDR) phenomena, of which, bias voltage and resonant orbitals can be tuned sensitively by the central ion of the molecule. Different dependences of the NDR peak on the tip−molecule distance at two bias polarities and rectifying phenomena are also interpreted in terms of specific structures of 3d orbitals of the adsorbed MPc and Ni tip.
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| Keywords:
68.37.Ef
85.65.+h
73.63.-b
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Received: 16 December 2010
Published: 29 June 2011
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| PACS: |
68.37.Ef
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(Scanning tunneling microscopy (including chemistry induced with STM))
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85.65.+h
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(Molecular electronic devices)
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73.63.-b
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(Electronic transport in nanoscale materials and structures)
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