scispace - formally typeset
Search or ask a question
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.


Papers
More filters
Journal ArticleDOI
TL;DR: A theory for the scanning tunneling microscope ~STM! current based on a Keldysh Green function formalism is presented and it is concluded that STM images should be analyzed by comparing iteratively the theory and the experiment, much in the same way as it is usually done for other surface sensitive techniques.
Abstract: We present a theory for the scanning tunneling microscope (STM) current based on a Keldysh Green function formalism. In our formalism, we solve self-consistently an ab initio linear combination of atomic orbitals Hamiltonian within a local density formalism. Total energy calculations for xenon deposited on metal surfaces are performed to obtain the equilibrium position, and the Green functions needed to compute the current are obtained at the same time. Structural and nonstructural effects that can influence the correct interpretation of experimental STM results are studied. We find good agreement between our calculations and experimental images taken under highly controlled conditions, and we conclude that STM images should be analyzed by comparing iteratively the theory and the experiment, much in the same way as it is usually done for other surface sensitive techniques like low-energy electron diffraction, photoelectron diffraction, surface-extended x-ray-absorption fine structure spectroscopy, etc. \textcopyright{} 1996 The American Physical Society.

93 citations

Journal ArticleDOI
TL;DR: In this paper, the authors used a scanning tunneling microscope to obtain images of both empty and filled states, which provided strong evidence for a particular structural model with a 3.2 unit cell.
Abstract: The Si(113) surface is very stable despite its high index but until now its atomic structure has been uncertain. Using a scanning tunneling microscope, we have obtained images of both empty and filled states which provide strong evidence for a particular structural model with a 3\ifmmode\times\else\texttimes\fi{}2 unit cell. We explain our results in terms of a general rehybridization principle which accounts for the low surface energy and the spatial distribution of empty and filled states. Our images reveal a high density of domain boundaries which introduce energy states that pin the Fermi level and explain earlier reports of a 3\ifmmode\times\else\texttimes\fi{}1 reconstruction.

93 citations

Journal ArticleDOI
TL;DR: In this paper, the inelastic electron tunneling spectrum (IETS) of pyrolitic graphite has been measured with scanning tunneling spectroscopy at 6 K. The observed spectral features are in very good agreement with the vibrational density of states of graphite calculated from first principles.
Abstract: The inelastic electron tunneling spectrum ~IETS! of highly oriented pyrolitic graphite has been measured with scanning tunneling spectroscopy ~STS! at 6 K. The observed spectral features are in very good agreement with the vibrational density of states of graphite calculated from first principles. We discuss the enhancement of certain phonon modes by phonon-assisted tunneling in STS based on the restrictions imposed by the electronic structure of graphite. We also demonstrate the local excitation of surface plasmons in IETS, which

93 citations

Journal ArticleDOI
25 Sep 2020-Science
TL;DR: In this article, a symmetric superlattice of zero-energy modes is proposed to induce metallicity in GNRs by inserting symmetric sublattices into otherwise semiconducting GNRs.
Abstract: The design and fabrication of robust metallic states in graphene nanoribbons (GNRs) are challenging because lateral quantum confinement and many-electron interactions induce electronic band gaps when graphene is patterned at nanometer length scales. Recent developments in bottom-up synthesis have enabled the design and characterization of atomically precise GNRs, but strategies for realizing GNR metallicity have been elusive. Here we demonstrate a general technique for inducing metallicity in GNRs by inserting a symmetric superlattice of zero-energy modes into otherwise semiconducting GNRs. We verify the resulting metallicity using scanning tunneling spectroscopy as well as first-principles density-functional theory and tight-binding calculations. Our results reveal that the metallic bandwidth in GNRs can be tuned over a wide range by controlling the overlap of zero-mode wave functions through intentional sublattice symmetry breaking.

93 citations

Journal ArticleDOI
TL;DR: Pumped up: Propene molecules form chiral complexes when adsorbed on a copper surface when inelastically scattered tunneling electrons from the tip of a scanning tunneling microscope induce rotation or diffusion of the adsorbate on the surface.
Abstract: Pumped up: Propene molecules form chiral complexes when adsorbed on a copper surface. Inelastically scattered tunneling electrons from the tip of a scanning tunneling microscope induce rotation or diffusion of the adsorbate on the surface. Higher tunneling currents can lead to conversion of the adsorbate into the opposite enantiomer.

93 citations


Network Information
Related Topics (5)
Band gap
86.8K papers, 2.2M citations
93% related
Quantum dot
76.7K papers, 1.9M citations
92% related
Magnetization
107.8K papers, 1.9M citations
90% related
Thin film
275.5K papers, 4.5M citations
90% related
Photoluminescence
83.4K papers, 1.8M citations
89% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202345
202289
2021128
2020143
2019134
2018159