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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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Journal ArticleDOI
TL;DR: In this paper, the Schottky barrier between the surface states and the bulk states is observed by scanning tunneling microscopy/spectroscopy (STM/STS) using artificially fabricated insulating trenches.
Abstract: Electronic properties of the $\mathrm{Si}(111)\ensuremath{-}(7\ifmmode\times\else\texttimes\fi{}7)$ surface are evaluated by scanning tunneling microscopy/spectroscopy (STM/STS) using artificially fabricated insulating trenches. When the surface is surrounded by a closed trench, the effect of the Schottky barrier naturally formed between the surface states and the bulk states is observed by STM. When a half-closed tape-shaped structure surrounded by the trench is fabricated, the current path is dominated by that through surface states. Its conductivity is estimated by measuring the voltage drop along the structure.

60 citations

Journal ArticleDOI
TL;DR: In this article, the adsorption energies and diffusion barriers of rare-earth (RE) adatoms (Nd, Gd, Eu, and Yb) on graphene were studied by first-principles calculations based on the density-functional theory.
Abstract: Adsorption of rare-earth (RE) adatoms (Nd, Gd, Eu, and Yb) on graphene was studied by first-principles calculations based on the density-functional theory. The calculations show that the hollow site of graphene is the energetically favorable adsorption site for all the RE adatoms studied. The adsorption energies and diffusion barriers of Nd and Gd on graphene are found to be larger than those of Eu and Yb. Comparison with scanning tunneling microscopy experiments for Gd and Eu epitaxially grown on graphene confirms these calculated adsorption and barrier differences, since fractal-like islands are observed for Gd and flat-topped crystalline islands for Eu. The formation of flat Eu islands on graphene can be attributed to its low diffusion barrier and relatively larger ratio of adsorption energy to its bulk cohesive energy. The interactions between the Nd and Gd adatoms and graphene cause noticeable in-plane lattice distortions in the graphene layer. Adsorption of the RE adatoms on graphene also induces significant electric dipole and magnetic moments.

60 citations

Journal ArticleDOI
TL;DR: The dependence of the oscillations observed in scanning tunneling microscopy of the tunneling conductance with applied bias voltage on the tip's curvature and the interface potential has been studied in this article.

60 citations

Journal ArticleDOI
TL;DR: A theory of quantum tunneling with dissipation with frequency-dependent transmission coefficient is constructed and a fluctuation-dissipation theorem for tunneling particles is derived.
Abstract: A theory of quantum tunneling with dissipation is constructed. The frequency-dependent transmission coefficient is calculated at zero and finite temperatures. A fluctuation-dissipation theorem for tunneling particles is derived.

60 citations

Journal ArticleDOI
TL;DR: In this paper, the authors propose a versatile experimental probe for cold atomic gases analogous to the scanning tunneling microscope (STM) in condensed matter, which uses the coherent coupling of a single particle to the system depending on the measurement sequence.
Abstract: We propose a versatile experimental probe for cold atomic gases analogous to the scanning tunneling microscope (STM) in condensed matter This probe uses the coherent coupling of a single particle to the system Depending on the measurement sequence, our probe allows us to obtain either the local density and spatial density correlations, with a resolution on the nanometer scale, or the single particle correlation function in real time We discuss applications of this scheme to the various possible phases for a two dimensional Hubbard system of fermions in an optical lattice

60 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202345
202289
2021128
2020143
2019134
2018159