Conductance of atom-sized Pb contacts

Details Conductance of atom-sized Pb contacts Conductance of atom-sized Pb contacts

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010njph...12k3010b&link_type=abstract

New Journal of Physics, Volume 12, Issue 11, pp. 113010 (2010).

Physics

Scientific paper

The contact formation of a metallic tip approaching Pb thin films supported on Ag(111) substrates is investigated with a cryogenic scanning tunnelling microscope. Although contacts to thicker Pb films are formed rather abruptly, the transition between tunnelling and contact is gradual for the first Pb monolayer on Ag(111). This behaviour may be understood in terms of different vertical bonding strengths due to a charge-transfer-induced surface dipole. Owing to the gradual evolution of tip-surface contacts on the first Pb(111) monolayer, imaging can be performed at contact. Furthermore, we show that for atomic-sized Pb contacts, the interpretation of peaks in conventional conductance histograms in terms of single-atom point-contact conductances yields an overestimation of contact conductances.

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