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: GXSM is a full featured and modern scanning probe microscopy (SPM) software that can be used for powerful multidimensional image/data processing, analysis, and visualization.
Abstract: GXSM is a full featured and modern scanning probe microscopy (SPM) software. It can be used for powerful multidimensional image/data processing, analysis, and visualization. Connected to an instrument, it is operating many different flavors of SPM, e.g., scanning tunneling microscopy and atomic force microscopy or, in general, two-dimensional multichannel data acquisition instruments. The GXSM core can handle different data types, e.g., integer and floating point numbers. An easily extendable plug-in architecture provides many image analysis and manipulation functions. A digital signal processor subsystem runs the feedback loop, generates the scanning signals, and acquires the data during SPM measurements. The programmable GXSM vector probe engine performs virtually any thinkable spectroscopy and manipulation task, such as scanning tunneling spectroscopy or tip formation. The GXSM software is released under the GNU general public license and can be obtained via the internet.
69 citations
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IBM1
TL;DR: Scanning tunneling microscopy experiments reveal that the degree of spin polarization of electrons tunneling from Ni into a semiconductor increases with decreasing potential barrier thickness.
Abstract: Scanning tunneling microscopy experiments reveal that the degree of spin polarization of electrons tunneling from Ni into a semiconductor increases with decreasing potential barrier thickness. The results show that the highly polarized $3d$ bands as well as the low-polarized $4sp$ bands contribute to the tunneling current and that the ratio of their tunneling probabilities depends on the potential barrier thickness and height. Furthermore, the tunneling potential barrier for the $3d$-like levels is estimated to be $\ensuremath{\sim}$1 eV higher than for the $4sp$ contribution.
69 citations
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TL;DR: In this paper, the structure of the ordered indium overlayer which forms at around one monolayer (ML) coverage at elevated temperature on Si(111)7 × 7 surfaces has been investigated by scanning tunneling microscopy (STM) and low energy electron diffraction (LEED).
68 citations
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TL;DR: Tin-phthalocyanine molecules adsorbed on Ag(111) were contacted with the tip of a cryogenic scanning tunneling microscope and Nonequilibrium Green's function calculations reproduce the trend of the conductance and visualize the current flow through the junction, which is guided through molecule-electrode chemical bonds.
Abstract: Tin-phthalocyanine molecules adsorbed on Ag(111) were contacted with the tip of a cryogenic scanning tunneling microscope. Orders-of-magnitude variations of the single-molecule junction conductance were achieved by controllably dehydrogenating the molecule and by modifying the atomic structure of the surface electrode. Nonequilibrium Green's function calculations reproduce the trend of the conductance and visualize the current flow through the junction, which is guided through molecule-electrode chemical bonds.
68 citations
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TL;DR: In this paper, on-surface synthesis and a proof-of-principle experimental study of magnetism in covalently bonded triangulene dimers are presented.
Abstract: Triangular zigzag nanographenes, such as triangulene and its pi-extended homologues, have received widespread attention as organic nanomagnets for molecular spintronics, and may serve as building blocks for high-spin networks with long-range magnetic order - of immense fundamental and technological relevance. As a first step toward these lines, we present the on-surface synthesis and a proof-of-principle experimental study of magnetism in covalently bonded triangulene dimers. On-surface reactions of rationally-designed precursor molecules on Au(111) lead to the selective formation of triangulene dimers in which the triangulene units are either directly connected through their minority sublattice atoms, or are separated via a 1,4-phenylene spacer. The chemical structures of the dimers have been characterized by bond-resolved scanning tunneling microscopy. Scanning tunneling spectroscopy and inelastic electron tunneling spectroscopy measurements reveal collective singlet-triplet spin excitations in the dimers, demonstrating efficient inter-triangulene magnetic coupling.
68 citations