Phys Rev Lett 1993, VX-680 71:1852.CrossRef 3. Muller CJ, van Ruitenbeek J M, de John LJ: Conductance and supercurrent discontinuities in atomic-scale metallic constrictions of variable width. Physica C 1992, 191:485.CrossRef 4. Landman U, Luedtke WD, Burnham NA, Colton RJ: Atomistic
mechanisms and dynamics of adhesion, nanoindentation, and fracture. Science 1990, 248:454.CrossRef 5. Untiedt C, Caturla MJ, Calvo MR, Palacios JJ, Segers RC, van Ruitenbeek JM: Formation of a metallic contact: jump to contact revisited. Phys Rev Lett 2007, 98:206801.CrossRef 6. Trouwborst ML, Huisman EH, Bakker FL, van der Molen SJ, van Wees BJ: Single atom adhesion in optimized gold nanojunctions. Phys Rev Lett 2008, 100:175502.CrossRef 7. Sabater C, Untiedt C, Palacios JJ, Caturla MJ: Mechanical annealing of metallic electrodes at the atomic scale. Phys Rev Lett 2012, 108:205502.CrossRef 8. Gómez AC, Bollinger GR, Garnica M, Barja S, Vazquez de Parga AL, Miranda R, Agraït N: Highly reproducible low temperature scanning tunneling microscopy and spectroscopy with in situ prepared tips. Ultramicroscopy 2012, 122:1–5.CrossRef 9. ALicante Atomistic SB431542 mouse Computation Applied to NanoTransport Package publicly available at [http://alacant.dfa.ua.es]
10. Zhoua XW, Wadleya HNG, Johnsona RA, Larsonb DJ, Tabatb N, Cerezoc A, Petford-Longc MRIP AK, Smithc GDW, Cliftond PH, Martense RL, Kellye TF: Atomic scale structure of sputtered metal multilayers. check details Phys Rev B 2001, 49:4005–4015. 11. Sørensen MR, Brandbyge M, Jacobsen KW: Mechanical deformation of atomic-scale metallic contacts: structure and mechanisms. Phys Rev B 1998, 57:3283–3294.CrossRef 12. Frisch MJ, Trucks GW, Schlegel HB, Scuseria
GE, Robb MA, Cheeseman JR, Scalmani G, Barone V, Mennucci B, Petersson GA, Nakatsuji H, Caricato M, Li X, Hratchian HP, Izmaylov AF, Bloino J, Zheng G, Sonnenberg JL, Hada M, Ehara M, Toyota K, Fukuda R, Hasegawa J, Ishida M, Nakajima T, Honda Y, Kitao O, Nakai H, Vreven T, Montgomery Jr. JA, et al.: Gaussian 09 Revision a.1. Wallingford: Gaussian Inc.; 2009. 13. Wang H, Leng Y: Molecular dynamics simulations of the stable structures of single atomic contacts in gold nanojunctions. Phys Rev B 2011, 84:245422.CrossRef Competing interests The authors declare that they have no competing interests. Authors’ contributions CS wrote the manuscript and did MD simulations and DFT calculations. CU and CS performed the experiments. MJC and JJP supervised the MD and DFT calculations. All the authors have participated in the outline of this research, in the bibliographical study and revised the manuscript. All authors read and approved the final manuscript.