C. Joachim – författare

Nano-science looks at nano-interfaces and nano-junctions, atomic and molecular manipulation of adsorbates, properties of self assembled films and quantum transport in nano-structures. Understanding of these phenomena at the nano-scale is of great importance for both science and technology. Computations for the Nano-Scale is the first book to present the state of the art of the theory of nano-science and some related experiments. It assembles contributions from leading experts who met for a NATO Workshop in Aspet, France, October 12--16, 1992.

There is a growing interest in the connection of a single molecule or a wire of atomic diameter between two electrodes. This has led to the investigation of a class of nanoscale materials: lines of metal atoms of atom-sized cross section, lines of atomic defects, and conjugated oligomers. Several ways to fabricate such materials are discussed, such as the self assembly of metal atoms on a surface under UHV, deposition from, or sliding with an STM tip apex, and local surface modification using a voltage pulse. The synthesis of molecular wires is also presented, the objective being to produce long, low-gap, rigid conjugated oligomers. The electrical connection of a single atomic or a single molecule is more challenging: mechanical (break junction) STM or nanolithographic coplanar junctions are currently being used to measure the resistance of a single nanometer-scale wire. The theoretical problems associated with such measurements involve both solid state physics and quantum chemistry.

Nano-science looks at nano-interfaces and nano-junctions, atomic and molecular manipulation of adsorbates, properties of self assembled films and quantum transport in nano-structures. Understanding of these phenomena at the nano-scale is of great importance for both science and technology. Computations for the Nano-Scale is the first book to present the state of the art of the theory of nano-science and some related experiments. It assembles contributions from leading experts who met for a NATO Workshop in Aspet, France, October 12--16, 1992.

This volume contains the proceedings of the NATO Advanced Research Workshop on "Atomic and Molecular Wires". It was sponsored by the Ministry of Scientific Affairs Division special program on Nanoscale Science with the support of the CNRS and the Max Planck Institute. Scientists working or interested in the properties of wires at a subnanoscale were brought together in Les Houches (France) from 6 to 10 May 1996. Subnanoscale wires can be fabricated either by surface physicists (atomic wires) or by synthetic chemists (molecular wires). Both communities present their foremost advances using, for example, STM to assemble atomic lines atom for atom, to fabricate a mask for such a line or using the wide range of chemical synthesis techniques to obtain long, rigid and conjugated oligomers. Interconnecting such tiny wires to sources (voltage, current) continues to demand a great technological effort. But nanolithography associated with microfabrication or STM are now clearly identified paths for measuring the electrical resistance of an atomic or a molecular wire. The first measurements have been reported on Xe , benzene, C ' di(phenylene-ethynylene) showing 2 60 the need for a deeper understanding of transport phenomena through subnanowires. Such transport phenomena like tunnel (off-resonance) transport and Coulomb blockade have been discussed by theorists with an emphasis on the exponential decrease of the tunnel current with the wire length versus the ballistic regime of transport.