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: In this article, the local electronic structure at rutile surfaces was studied by scanning tunneling spectroscopy (STS) images, and structural features such as step edges and reconstructed strands were correlated to changes in tunneling spectrum.
Abstract: Variation of the local electronic structure at rutile ${\mathrm{TiO}}_{2}(110)$ surfaces was studied by scanning tunneling spectroscopy (STS). Structural surface features such as step edges, $(1\ifmmode\times\else\texttimes\fi{}2)$ reconstructed strands, and their terminations were correlated to changes in tunneling spectra. In particular, band-gap states, associated with a reduced surface, showed characteristic variations. In addition, electronic variations due to extrinsic defects are discussed. Nanometer wide protrusions in constant current scanning tunneling microscopy images were identified in STS as local electronic alterations. These features are interpreted to be due to local band bending induced by individual, charged impurity atoms.
75 citations
TL;DR: From an interplay between simultaneously recorded noncontact atomic force microscopy and scanning tunneling microscopy images and simulations based on density functional theory, the location of single hydrogen species is revealed in the surface and subsurface layers of rutile TiO2.
Abstract: From an interplay between simultaneously recorded noncontact atomic force microscopy and scanning tunneling microscopy images and simulations based on density functional theory, we reveal the location of single hydrogen species in the surface and subsurface layers of rutile ${\mathrm{TiO}}_{2}$. Subsurface hydrogen atoms (${\mathrm{H}}_{\mathrm{sub}}$) are found to reside in a stable interstitial site as subsurface OH groups detectable in scanning tunneling microscopy as a characteristic electronic state but imperceptible to atomic force microscopy. The combined atomic force microscopy, scanning tunneling microscopy, and density functional theory study demonstrates a general scheme to reveal near surface defects and interstitials in poorly conducting materials.
75 citations
TL;DR: A photonic analog of Klein tunneling for a relativistic electron across a potential step, based on spatial light propagation in an engineered binary waveguide array, is proposed in this paper.
Abstract: A photonic analog of Klein tunneling for a relativistic electron across a potential step, based on spatial light propagation in an engineered binary waveguide array, is proposed. Klein tunneling can be simply visualized as optical beam refraction through a step-index interface, superimposed to the superlattice, and explained as an interband tunneling process between positive-energy (electron) and negative-energy (positron) minibands of the superlattice. Inhibition of Klein tunneling for a smooth potential step is also demonstrated.
75 citations
75 citations
TL;DR: Low-temperature scanning tunneling spectroscopy of magnetic and nonmagnetic metal atoms on Ag(111) and on Cu( 111) surfaces reveals the existence of a common electronic resonance at an energy below the binding energies of the surface states.
Abstract: Low-temperature scanning tunneling spectroscopy of magnetic and nonmagnetic metal atoms on Ag(111) and on Cu(111) surfaces reveals the existence of a common electronic resonance at an energy below the binding energies of the surface states. Using an extended Newns-Anderson model, we assign this resonance to an adsorbate-induced bound state, split off from the bottom of the surface-state band, and broadened by the interaction with bulk states. A line shape analysis of the bound state indicates that Ag and Cu adatoms on Ag(111) and Cu(111), respectively, decrease the surface-state lifetime, while a cobalt adatom causes no significant change.
75 citations