Closed-loop conductance scanning tunneling spectroscopy: demonstrating the equivalence to the open-loop alternative

Beilstein Journal of Nanotechnology

Kai Sotthewes¹  Harold J. W. Zandvliet¹  E. Stefan Kooij¹  Chris Hellenthal¹  Martin H. Siekman¹ 

[1] Physics of Interfaces and Nanomaterials, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE, Enschede, Netherlands;

关键词: image charge;    scanning tunneling spectroscopy (STS);    tunneling barrier;    work function;    z(V);   

DOI  :  10.3762/bjnano.6.113

来源: DOAJ

【 摘 要 】

We demonstrate the validity of using closed-loop z(V) conductance scanning tunneling spectroscopy (STS) measurements for the determination of the effective tunneling barrier by comparing them to more conventional open-loop I(z) measurements. Through the development of a numerical model, the individual contributions to the effective tunneling barrier present in these experiments, such as the work function and the presence of an image charge, are determined quantitatively. This opens up the possibility of determining tunneling barriers of both vacuum and molecular systems in an alternative and more detailed manner.

【 授权许可】

Unknown