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- W1710358468 abstract "Using scanning tunneling microscopy (STM), we investigated the evolution of electrical conductance between a Pb tip and Pb(111) surface from tunneling to atomic point contact at a site that was defined with atomic precision. We found that the conductance evolution depended on the contact site, for instance, on-top, bridge, or hollow (hcp and fcc) sites in the Pb lattice. In the transition from tunneling to contact regimes, the conductance measured at the on-top site was enhanced. In the point contact regime, the hollow sites had conductances larger than those of the other sites, and between the hollow sites, the hcp site had a conductance larger than that of the fcc site. We also observed the enhancement and reversal of the apparent height in atomically resolved high-current STM images, consistent with the results of the conductance traces. Our results indicate the importance of atomic configuration in the conductance of atomic junctions and suggest that attractive chemical interactions have a significant role in electron transport between contacting atoms.Received 20 January 2015DOI:https://doi.org/10.1103/PhysRevLett.114.206801© 2015 American Physical Society" @default.
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- W1710358468 date "2015-05-22" @default.
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- W1710358468 title "Site-Dependent Evolution of Electrical Conductance from Tunneling to Atomic Point Contact" @default.
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- W1710358468 doi "https://doi.org/10.1103/physrevlett.114.206801" @default.
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