@article{discovery141512,
       publisher = {AMERICAN PHYSICAL SOC},
           month = {May},
          volume = {98},
            year = {2007},
           title = {Formation of a metallic contact: Jump to contact revisited},
         journal = {PHYS REV LETT},
          number = {20},
            note = {{\copyright} 2007 The American Physical Society},
            issn = {0031-9007},
        keywords = {SINGLE-ATOM CONTACT, TRANSITION-METALS, ADHESION, CONDUCTANCE, MECHANISMS, SIGNATURE, TIP},
          author = {Untiedt, C and Caturla, MJ and Calvo, MR and Palacios, JJ and Segers, RC and Van Ruitenbeek, JM},
             url = {http://dx.doi.org/10.1103/PhysRevLett.98.206801},
        abstract = {The transition from tunneling to metallic contact between two surfaces does not always involve a jump, but can be smooth. We have observed that the configuration and material composition of the electrodes before contact largely determine the presence or absence of a jump. Moreover, when jumps are found preferential values of conductance have been identified. Through a combination of experiments, molecular dynamics, and first-principles transport calculations these conductance values are identified with atomic contacts of either monomers, dimers, or double-bond contacts.}
}