Topic
Scanning tunneling spectroscopy
About: Scanning tunneling spectroscopy is a research topic. Over the lifetime, 7886 publications have been published within this topic receiving 213828 citations.
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TL;DR: Atomically resolved scanning tunneling microscopy (STM) images from TiO 2(110) surfaces resolve a controversy as to whether STM imaging on this surface is dominated by geometric-structure or electronic effects.
Abstract: We present atomically resolved scanning tunneling microscopy (STM) images from Ti${\mathrm{O}}_{2}$(110) surfaces. After annealing nearly perfect stoichiometric $1\ifmmode\times\else\texttimes\fi{}1$ surfaces to elevated temperatures in ultrahigh vacuum, randomly distributed oxygen vacancies are observed. The apparent shape of these defects provides strong evidence that the STM is imaging undercoordinated Ti atoms, as do first-principles pseudopotential calculations of the electronic states accessible to tunneling. We thus resolve a controversy as to whether STM imaging on this surface is dominated by geometric-structure or electronic effects.
319 citations
TL;DR: The successful synthesis of germanene on molybdenum disulfide (MoS_{2}), a band gap material, is reported, showing that there are, besides the linearly dispersing bands at the K points, two parabolic bands that cross the Fermi level at the Γ point.
Abstract: To date germanene has only been synthesized on metallic substrates. A metallic substrate is usually detrimental for the two-dimensional Dirac nature of germanene because the important electronic states near the Fermi level of germanene can hybridize with the electronic states of the metallic substrate. Here we report the successful synthesis of germanene on molybdenum disulfide (MoS 2 ), a band gap material. Preexisting defects in the MoS 2 surface act as preferential nucleation sites for the germanene islands. The lattice constant of the germanene layer (3.8±0.2 A ) is about 20% larger than the lattice constant of the MoS 2 substrate (3.16 A). Scanning tunneling spectroscopy measurements and density functional theory calculations reveal that there are, besides the linearly dispersing bands at the K points, two parabolic bands that cross the Fermi level at the Γ point.
318 citations
305 citations
TL;DR: In this article, topology related changes in the local density of states near the ends of closed carbon nanotubes are investigated using spatially resolved scanning tunneling spectroscopy and tight binding calculations.
Abstract: Topology related changes in the local density of states near the ends of closed carbon nanotubes are investigated using spatially resolved scanning tunneling spectroscopy and tight binding calculations. Sharp resonant valence band states are observed in the experiment at the tube ends, dominating the valence band edge and filling the band gap. Calculations show that the strength and position of these states with respect to the Fermi level depend sensitively on the relative positions of pentagons and their degree of confinement at the tube ends.
294 citations
IBM1
TL;DR: In this article, a simple theoretical model provides a quantitative connection between the tunneling data and both previous and new inverse-photo-emission data, which is used to study image-type surface states.
Abstract: Tunneling spectroscopy performed with the scanning tunneling microscope is used to study image-type surface states. The tunneling tip causes a Stark shift and expansion of the hydrogenic image-state spectrum, permitting a clear resolution of the individual states. A simple theoretical model provides a quantitative connection between the tunneling data and both previous and new inverse-photoemission data.
290 citations