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: Reflectance difference spectroscopy, scanning tunneling microscopy, and calculations of th RDS spectra have been performed, thereby relating identifie structures with RDS features, and excellent agreement between measured and calculated spectra is demonstrated.
Abstract: Reflectance difference spectroscopy (RDS), scanning tunneling microscopy, and calculations of th RDS spectra have been performed for the bare Si(001) surface and Si(001):As, thereby relating identifie structures with RDS features. For the As-terminated surface, which exhibits a 2 3 1 symmetric As-As dimer structure, we demonstrate excellent agreement between measured and calculated spectra. clean Si(001), which shows a more complex structure arising from dimer asymmetry, we provide identification of RDS spectral features arising from transitions between dangling-bond surface states.
90 citations
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TL;DR: A big discrepancy is demonstrated in strong field ionization between the Bohmian and weak measurement values of tunneling time, and it is suggested that tunneling is unlikely to be an instantaneous process.
Abstract: Tunneling delays represent a hotly debated topic, with many conflicting definitions and little consensus on when and if such definitions accurately describe the physical observables. Here, we relate these different definitions to distinct experimental observables in strong field ionization, finding that two definitions, Larmor time and Bohmian time, are compatible with the attoclock observable and the resonance lifetime of a bound state, respectively. Both of these definitions are closely connected to the theory of weak measurement, with Larmor time being the weak measurement value of tunneling time and Bohmian trajectory corresponding to the average particle trajectory, which has been recently reconstructed using weak measurement in a two-slit experiment [S. Kocsis, B. Braverman, S. Ravets, M. J. Stevens, R. P. Mirin, L. K. Shalm, and A. M. Steinberg, Science 332, 1170 (2011)]. We demonstrate a big discrepancy in strong field ionization between the Bohmian and weak measurement values of tunneling time, and we suggest this arises because the tunneling time is calculated for a small probability postselected ensemble of electrons. Our results have important implications for the interpretation of experiments in attosecond science, suggesting that tunneling is unlikely to be an instantaneous process.
90 citations
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TL;DR: In this article, the half-metallic density of states (DOS) was observed by scanning tunneling spectroscopy on ferromagnetic La(0.7)Ca( 0.3)MnO(3) which exhibits colossal magnetoresistance (SMR).
Abstract: Direct experimental evidence of half-metallic density of states (DOS) is observed by scanning tunneling spectroscopy on ferromagnetic La(0.7)Ca(0.3)MnO(3) which exhibits colossal magnetoresistance (SMR).
90 citations
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TL;DR: Superconductivity of nanosized Pb-island structures whose radius is 0.8 to 2.5 times their coherence length was studied under magnetic fields using low-temperature scanning tunneling microscopy and spectroscopy.
Abstract: Superconductivity of nanosized Pb-island structures whose radius is 0.8 to 2.5 times their coherence length was studied under magnetic fields using low-temperature scanning tunneling microscopy and spectroscopy. Spatial profiles of superconductivity were obtained by conductance measurements at zero-bias voltage. Critical magnetic fields for vortex penetration and expulsion and for superconductivity breaking were measured for each island. The critical fields depending on the lateral size of the islands and existence of the minimum lateral size for vortex formation were observed.
90 citations
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TL;DR: The presence of bridging oxygen defects introduces two new adsorption structures, the most stable of which involves CO(2) molecules bound in tilted configurations at the defect sites.
Abstract: Adsorption of CO2 on the rutile(110) surface was investigated using dispersion-corrected density functional theory and scanning tunneling microscopy (STM). On the oxidized surface the CO2 molecules are found to bind most strongly at the five-fold coordinated Ti sites adopting tilted or flat configurations. The presence of bridging oxygen defects introduces two new adsorption structures, the most stable of which involves CO2 molecules bound in tilted configurations at the defect sites. Inclusion of dispersion corrections in the density functional theory calculations leads to large increases in the calculated adsorption energies bringing these quantities into good agreement with experimental data. The STM measurements confirm two of the calculated adsorption configurations.
90 citations