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Electron Transport through Single-Atom Nanowires and Single Molecules Nicolás Agraït

Electron Transport through Single-Atom Nanowires and Single Molecules Nicolás Agraït. Low Temperature Laboratory Universidad Autónoma de Madrid nicolas.agrait@uam.es.

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Electron Transport through Single-Atom Nanowires and Single Molecules Nicolás Agraït

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  1. Electron Transport through Single-Atom Nanowires and Single MoleculesNicolás Agraït Low Temperature LaboratoryUniversidad Autónoma de Madridnicolas.agrait@uam.es Freely suspended nanowires of single atoms are the ultimate metallic conductors, they form spontaneously in the process of breaking a metallic contact of certain metals (Au, Pt and Ir) [1, 2]. Atomic nanowires of gold have a zero bias conductance close to one quantum of conductance G0 = 2 e2/h (where e is the charge of the electron and h is Planck’s constant), independently of their length, because electron transport proceeds through one single quantum conductance channel which is almost completely open. At low temperatures, these nanowires are very stable allowing for vibrational spectroscopy [3] and force measurements [4] which give valuable information about the mechanical properties and dynamics of the system. Similarly, breaking a metallic contact in the presence of molecules in solution [5] or at low surface coverage may also be used to form single molecule junctions. After a review of some of the important results in the field, I will present our latest results on single atom nanowires and single molecules. References: [1]. A.I, Yanson, G. Rubio Bollinger, H.E. van den Brom, N. Agraït, J.M. van Ruitenbeek, Formation and manipulation of a metallic wire of single gold atoms, Nature 395, 783 (1998). [2]. N. Agrait, A. Levy-Yeyati, J.M. van Ruitenbeek, Quantum properties of atomic-sized conductors, Phys. Reps. 377, 81-380 (2003). [3]. N. Agraït, C. Untiedt, G. Rubio-Bollinger, S. Vieira, Onset of energy dissipation in ballistic atomic wires, Phys. Rev. Lett. 88, 216803 (2002). [4]. G. Rubio-Bollinger, S.R. Bahn, N. Agraït, K.W. Jacobsen, S. Vieira, Mechanical properties and formation mechanisms of a wire of single gold atoms, Phys. Rev. Lett. 87, 026101(2001). [5]. Bingqian Xu and Nongjian J. Tao, Measurement of Single-Molecule Resistance by Repeated Formation of Molecular Junctions, Science 301, 1221 (2003).

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