First-principle simulation of scanning tunneling microscopy/spectroscopy with cluster models of W, Pt, TiC, and impurity adsorbed tips

Journal Article · · Journal of Vacuum Science and Technology. B, Microelectronics Processing and Phenomena; (United States)

DOI:https://doi.org/10.1116/1.585592· OSTI ID:5221570

Isshiki, Nobuyuki ^[1]; Kobaryashi, Katsuyoshi; Tsukada, Masaru ^[2]

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1. Kao Corp., Tokyo (Japan)
2. Univ. of Tokyo (Japan)

Tunneling current and conductance in scanning tunneling microscopy/spectroscopy (STM/STS) and calculated for various kind of tips using first-principle local density approximation (LDA) method with the tunneling-Hamiltonian formalism. As models of tip, tungsten cluster, platinum cluster, carbon adsorbed tungsten cluster, and titanium carbide cluster are used. Graphite surface is used for the simulation. STM image and qualitative feature of STS spectrum mainly depend on the arrangement of atoms at the tip apex and not so much affected by the atomic compositions of the tip because the most of tunneling current comes from a single or a few atom at the tip apex.

• OSTI ID: 5221570
• Journal Information: Journal of Vacuum Science and Technology. B, Microelectronics Processing and Phenomena; (United States), Journal Name: Journal of Vacuum Science and Technology. B, Microelectronics Processing and Phenomena; (United States) Vol. 9:2; ISSN 0734-211X; ISSN JVTBD
• Country of Publication: United States
• Language: English

Related Subjects

440800* -- Miscellaneous Instrumentation-- (1990-)
47 OTHER INSTRUMENTATION
ADSORPTION
CARBIDES
CARBON COMPOUNDS
COMPUTERIZED SIMULATION
CURRENTS
DESIGN
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELECTRON MICROSCOPY
ELECTRONIC STRUCTURE
ELEMENTS
METALS
MICROSCOPES
MICROSCOPY
PHYSICAL PROPERTIES
PLATINUM
PLATINUM METALS
SIMULATION
SORPTION
SPECTROSCOPY
TITANIUM CARBIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TUNGSTEN
TUNNEL EFFECT