How do the electronic properties of a metal atom change when clusters of different sizes and geometry are formed? Nilius et al. (p. 1853) used scanning tunneling microscopy (STM) to build gold chains with defined numbers of atoms on a nickel-aluminum alloy surface. They then used the STM to perform scanning tunneling spectroscopy on these structures. Conductivity spectra taken at 30 points alon...

Metal particles (Au, Pd and Ni) with an average diameter between 7 to 100 ,~ have been prepared on thin metal oxide films (TiO 2, MgO and A1203), epitaxially grown on refractory metal substrates {Mo(100) or Re(0001)}, and imaged using scanning tunneling microscopy (STM). Information regarding the local electronic structure has been obtained using scanning tunneling spectroscopy (STS). Controlle...

Bias dependent scanning tunneling microscopy and scanning tunneling spectroscopy have been used to characterize the influence of transverse electric fields on the electronic properties of boron-nitride nanotubes (BNNTs). We find experimental evidence for the theoretically predicted giant Stark effect. The observed giant Stark effect significantly reduces the band gap of BNNTs and thus greatly e...

We report scanning tunneling microscopy (STM) images of surfaces of GaN films and the observation of luminescence from those films induced by highly spatially localized injection of electrons or holes using STM. This combination of scanning tunneling luminescence (STL) with STM for GaN surfaces and the ability to observe both morphology and luminescence in GaN is the first step to investigate p...