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 paper, nonresonant carrier tunneling is investigated by time-resolved and time-averaged optical methods for a series of samples with various barrier thicknesses.
Abstract: Nonresonant carrier tunneling is investigated by time‐resolved and time‐averaged optical methods for a series of samples with various barrier thicknesses. The electron tunneling times decrease exponentially with the decrease of barrier thickness from 8 to 3 nm, and the trend is well described by a semiclassical model. Additional efficient hole tunneling is observed in the 3 nm barrier sample, and the time constant is of the order of 50 ps.
60 citations
TL;DR: These states are localized along chains of Fe atoms in domain boundaries of the Fe(100) cs2 3 2dSi surface alloy, as confirmed by first-principles spinpolarized calculations.
Abstract: Scanning tunneling spectroscopy permits real-space observation of one-dimensional electronic states on a Fe(100) surface alloyed with Si. These states are localized along chains of Fe atoms in domain boundaries of the Fe(100) cs2 3 2dSi surface alloy, as confirmed by first-principles spinpolarized calculations. The calculated charge densities illustrate the d-like orbital character of the one-dimensional state and show its relationship to a two-dimensional state existing on the pure Fe(100) surface. [S0031-9007(96)00335-3]
60 citations
TL;DR: In this article, the authors investigated the dynamics of a hydroxyl group and its dimer adsorbed on Cu(110) with a scanning tunneling microscope (STM).
Abstract: Dynamics of a hydroxyl (OH) group and its dimer adsorbed on Cu(110) is investigated at 6 K with a scanning tunneling microscope (STM). For the monomer, the inclined OH axis switches back and forth between the two equivalent orientations via hydrogen-atom tunneling. The motion is enhanced by tunneling electron that excites the OH bending mode that directly correlates with the reaction coordinate. The inelastic electron-tunneling spectra exhibit either peak or dip, depending on the position of the STM tip over the molecule. The switch motion is quenched for the hydroxyl dimer since it is stabilized by hydrogen-bond formation, whereas it is induced by inelastic excitation of the OH stretch mode.
59 citations
TL;DR: In this article, the authors reported measurements of electron tunneling through thin AlN films in which the imaginary component of the propagation vector in the forbidden band has been determined as a function of energy from the dependence of the tunneling current upon insulator thickness.
Abstract: We report here measurements of electron
tunneling through thin AlN films in which the
imaginary component of the propagation vector
in the forbidden band has been determined as
a function of energy from the dependence of
the tunneling current upon insulator thickness.
The relationship so derived agrees well with
Franz's empirical relationship for a material
with the 4.2-eV forbidden-band energy of AlN.
These results allow the prediction of voltage-current
characteristics over the entire range
of experimental variables with no arbitrary
adjustable parameters, and also subject to several
internal self-consistency checks. In each
case complete consistency is observed, To
the authors' knowledge, this represents the
first unambiguous demonstration of such consistency
in thin-film tunneling.
59 citations
TL;DR: Using tunneling spectroscopy, hybrid magnetic complexes from V atoms and tetracyanoethylene ligands via atomic manipulation with a cryogenic scanning tunneling microscope are fabricated and spin-polarized molecular orbitals as well as Kondo behavior are observed.
Abstract: We have fabricated hybrid magnetic complexes from V atoms and tetracyanoethylene ligands via atomic manipulation with a cryogenic scanning tunneling microscope Using tunneling spectroscopy we observe spin-polarized molecular orbitals as well as Kondo behavior For complexes having two V atoms, the Kondo behavior can be quenched for different molecular arrangements, even as the spin-polarized orbitals remain unchanged This is explained by variable spin-spin (ie, V-V) ferromagnetic coupling through a single tetracyanoethylene (TCNE) molecule, as supported by density functional calculations
59 citations