Structural properties of materials at the nanoscale (Reeves, Gaston)

The difference between trapping by tunnelling through the bandgap barriers and trapping at defect sites will be investigated. The results will contribute to understanding charge transport properties in wide-band gap optical materials. Our theoretical insight will also be applied to calculate the structures of metallic systems from first-principles, developing new techniques that enable us to […]

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Optoelectronic properties of nanoscale and advanced materials (Ruck, Trodahl, Reeves, LeRu, Metson, Williams)

Several members of the rare-earth nitride series are known to be magnetic semiconductors, and we will measure their electrical conductivity and photoconductivity at room temperature and in their low-temperature magnetic phase. The results will be interpreted in terms of modern band structure calculations, and in terms of models of the crystalline defects in the materials. […]

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Superconducting and spin-dependent properties of novel materials (Tallon, Williams, Trodahl, Ruck)

We have a high-profile programme investigating high-temperature superconductors (HTS) and related materials. We focus on achieving a thermodynamic understanding of HTS by determining the pressure-, temperature-, doping- and ion-size-dependence of all the important energy and length scales pertinent to superconductivity using NMR, specific heat, Raman and muon spin relaxation. We also continue the search for […]

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Understanding electronic and optical properties of nanoparticles and nanostructures (Gaston, Kaiser, LeRu)

Further work will be aimed at understanding electronic transport in graphene, a new form of carbon, consisting of a single layer of carbon atoms that has many unique properties.  One focus will be graphene prepared by different techniques.  Finally, electronic structure calculations are used to characterise the development of metallicity in nanoscale metal clusters.  This […]

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Oct
03

Electronic and Optical Materials

Conventional theories of the optical and electronic properties of materials assume electrons propagating independently in 3D crystals with a periodic array of atoms and uniform propagation of light. Many materials displaying novel or exploitable properties do not fit within these bounds. Examples include the optical properties of nanoparticles or nanoparticle assemblies, where light both scatters […]

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