Research in the Theory of Nanostructured materials Facility

Steven G. Louie, Scientific Director
Jeffrey Neaton, Acting Facility Director

Theory and simulation are cross-cutting, synergistic activities of central importance to the Molecular Foundry. Theory Facility activities push the frontiers of computational nanoscience in areas that overlap with the interests of the five other Foundry facilities. Currently, our internal research spans several broad areas, including nanoelectronics, nanomechanics, nanoscale photovoltaics, new materials, soft matter and biological nanostructures, and new computational methods. The internal program has benefited greatly from close collaborations with Users, which have produced important augmentations of the facility’s capabilities. In the areas of nanoelectronics and energy, effort has centered on the electronic properties of the metal-organic interface and single-molecule conductance, with potential applications to organic electronics and photovoltaics. In the areas of nanomechanics and new materials, the effort has been focused on the mechanical and dynamical properties of different nanostructures, including work describing friction between nanotubes, mass transport on nanotube surfaces, the electronic properties of silicon nanowires, X-ray spectroscopy of solvated biological molecules, and nanoscale magnetism in complex oxide ultrathin films. In addition, several projects aim to develop new computational methods, including the construction of new empirical force-fields for describing nanoparticles and nanoparticle assemblies, developing efficient methods for accurate prediction of optical and X-ray spectroscopy of nanostructures, and the testing and improvement of a new method for calculating nanoelectrical transport at finite bias voltage.

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Selected Internal and User research topics

  • Electron conduction through amine-Au linked single-molecule junctions
  • Renormalization of molecular electronic levels at metal-molecule interfaces
  • Negative differential resistance in hybrid organic-Si molecular junctions
  • X-ray spectroscopy of biological nanostructures
  • Novel nanostructures and nanoscale assemblies for solar energy and catalysis
  • Optical properties of nanostructured iron oxides
  • Metal adatom adsorption on graphene
  • Structural and Electronic Properties of Carbon Nanotube Heterojunctions
  • Energy dissipation - velocity dependence of friction between coaxial carbon nanotubes
  • Structural transformations of carbon nanotubes under hydrostatic pressure
  • Bias-assisted indium mass transport on nanotube surfaces
  • Electronic properties of tapered silicon nanowires
  • Spin-polarized transport in magnetic nanojunctions
  • Structural, electronic and magnetic properties of nanostructured SrRuO3 epitaxial thin films
  • Solid-state quantum computation
  • Charge transport of alkanethiol self-assembled monolayers on Au
  • New methodologies for large-scale excited-state calculations of nanostructures