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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 article, a theory for interband tunneling in semiconducting carbon nanotube and graphene nanoribbon p−n junction diodes was developed for 1D carbon structures.
Abstract: A theory is developed for interband tunneling in semiconducting carbon nanotube and graphene nanoribbon p−n junction diodes. Characteristic length and energy scales that dictate the tunneling probabilities and currents are evaluated. By comparing the Zener tunneling processes in these structures to traditional Group IV and III–V semiconductors, it is proved that for identical bandgaps, carbon-based one-dimensional (1D) structures have higher tunneling currents. The high tunneling current magnitudes for 1D carbon structures suggest the distinct feasibility of high-performance tunneling-based field-effect transistors.

96 citations

Posted Content
TL;DR: In this article, the authors report scanning tunneling spectroscopy studies of the electronic structure of 1.5 to 3 nm textured MgO layers grown on (001) Fe.
Abstract: We report scanning tunneling spectroscopy studies of the electronic structure of 1.5 to 3 nm (001) textured MgO layers grown on (001) Fe. Thick MgO layers exhibit a bulk-like band gap, approximately 5-7 eV, and sparse, localized defect states with characteristics attributable to oxygen and, in some cases, Mg vacancies. Thin MgO layers exhibit electronic structure indicative of interacting defect states forming band tails which in the thinnest case extend to approximately 0.5 V of the Fermi level. These vacancy defects are ascribed to compressive strain from the MgO/Fe lattice mismatch, accommodated as the MgO grows.

96 citations

Journal ArticleDOI
15 Jun 2001-Science
TL;DR: Using spin-polarized scanning tunneling microscopy in an external magnetic field, magnetic hysteresis on a nanometer scale in an ultrathin ferromagnetic film is observed and a residual domain 6.5 nanometers by 5 nanometers in size is found which is inherently stable in saturation fields.
Abstract: Using spin-polarized scanning tunneling microscopy in an external magnetic field, we have observed magnetic hysteresis on a nanometer scale in an ultrathin ferromagnetic film. An array of iron nanowires, being two atomic layers thick, was grown on a stepped tungsten (110) substrate. The microscopic sources of hysteresis in this system-domain wall motion, domain creation, and annihilation-were observed with nanometer spatial resolution. A residual domain 6.5 nanometers by 5 nanometers in size has been found which is inherently stable in saturation fields. Its stability is the consequence of a 360 degrees spin rotation. With magnetic memory bit sizes approaching the superparamagnetic limit with sub-10 nanometer characteristic lengths, the understanding of the basic physical phenomena at this scale is of fundamental importance.

95 citations

Journal ArticleDOI
TL;DR: In this paper, the spin dependence of elastic and inelastic electron tunneling through transition metal atoms was investigated and it was shown that the additional conservation of spin angular momentum leads to different cross-sections for spin excitations depending on the relative alignment of the surface spin and the spin of the tunneling electron.
Abstract: We report on the spin dependence of elastic and inelastic electron tunneling through transition metal atoms. Mn, Fe and Cu atoms were deposited onto a monolayer of Cu2N on Cu(100) and individually addressed with the probe tip of a scanning tunneling microscope. Electrons tunneling between the tip and the substrate exchange energy and spin angular momentum with the surface-bound magnetic atoms. The conservation of energy during the tunneling process results in a distinct onset threshold voltage above which the tunneling electrons create spin excitations in the Mn and Fe atoms. Here we show that the additional conservation of spin angular momentum leads to different cross-sections for spin excitations depending on the relative alignment of the surface spin and the spin of the tunneling electron. For this purpose, we developed a technique for measuring the same local spin with a spin-polarized and a non-spin-polarized tip by exchanging the last apex atom of the probe tip between different transition metal atoms. We derive a quantitative model describing the observed excitation cross-sections on the basis of an exchange scattering process.

95 citations

Journal ArticleDOI
TL;DR: In this article, a tight-binding model of single-wall carbon nanotubes with curvature-modified hopping parameter was presented, from which an analytical relation of band gaps to both chirality and diameter was derived by developing a transfer matrix method.
Abstract: We present a tight-binding model of single-wall carbon nanotubes with curvature-modified hopping parameter ${\ensuremath{\gamma}}_{i},$ from which an analytical relation of band gaps to both chirality and diameter is derived by developing a transfer matrix method. The results are in agreement with the experimental results obtained from scanning tunneling microscopy and scanning tunneling spectroscopy measurements by three groups.

95 citations


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