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Chin. Phys. B, 2016, Vol. 25(3): 036801    DOI: 10.1088/1674-1056/25/3/036801

Image potential states mediated STM imaging of cobalt phthalocyanine on NaCl/Cu(100)

Qinmin Guo(郭秦敏)1, Zhihui Qin(秦志辉)1, Min Huang(黄敏)1, Vladimir N. Mantsevich 2, Gengyu Cao(曹更玉)1
1. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;
2. Faculty of Physics, Moscow State University, Moscow 119991, Russia
Abstract  The adsorption and electronic properties of isolated cobalt phthalocyanine (CoPc) molecule on an ultrathin layer of NaCl have been investigated. High-resolution STM images give a detailed picture of the lowest unoccupied molecular orbital (LUMO) of an isolated CoPc. It is shown that the NaCl ultrathin layer efficiently decouples the interaction of the molecules from the underneath metal substrate, which makes it an ideal substrate for studying the properties of single molecules. Moreover, strong dependence of the appearance of the molecules on the sample bias in the region of relatively high bias (>3.1 V) is ascribed to the image potential states (IPSs) of NaCl/Cu(100), which may provide us with a possible method to fabricate quantum storage devices.
Keywords:  image potential states      NaCl ultrathin layer      CoPc      scanning tunneling microscopy  
Received:  30 September 2015      Revised:  28 December 2015      Accepted manuscript online: 
PACS:  68.37.-d (Microscopy of surfaces, interfaces, and thin films)  
  68.37.Ef (Scanning tunneling microscopy (including chemistry induced with STM))  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 21203239 and 21311120059) and RFBR (Grant No. 13-02-91180).
Corresponding Authors:  Gengyu Cao     E-mail:

Cite this article: 

Qinmin Guo(郭秦敏), Zhihui Qin(秦志辉), Min Huang(黄敏), Vladimir N. Mantsevich , Gengyu Cao(曹更玉) Image potential states mediated STM imaging of cobalt phthalocyanine on NaCl/Cu(100) 2016 Chin. Phys. B 25 036801

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