Contributions of higher angular momentum states to lateral resolution in scanning tunneling microscopy
| Autor: | Dragan Šestović, Marijan Šunjić |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Physics
Angular momentum business.industry Resolution (electron density) Scanning tunneling spectroscopy Spin polarized scanning tunneling microscopy Conductive atomic force microscopy Curvature Molecular physics NATURAL SCIENCES. Physics law.invention PRIRODNE ZNANOSTI. Fizika Condensed Matter::Materials Science Optics law Condensed Matter::Superconductivity Scanning tunneling microscope business Quantum tunnelling |
| Zdroj: | Physical Review B (Condensed Matter) Volume 51 Issue 19 |
| ISSN: | 0163-1829 |
| DOI: | 10.1103/PhysRevB.51.13760 |
| Popis: | We investigate the influence of higher angular momentum states (AMS's) to the formation of a scanning tunneling microscopy (STM) image. We calculate the tunneling current between the STM tip, represented by the rotational paraboloid, and the sample, consisting of hemispherical protrusions on the flat metallic surface, using the Bardeen transfer Hamiltonian method. The electron wave function in the paraboloidal tip is expanded in the AMS's which are the eigenstates of a spherical tip. The total STM image can be constructed using the matrix elements for the tunneling of these particular states. We numerically simulate the STM image of a sample surface and calculate the contributions of a particular AMS to the STM image and to the lateral resolution, showing that higher AMS's essentially improve the resolution in the STM iamge. Contributions and lateral resolutions of various angular momentum channels are found to depend strongly on the curvature on the tip apex. |
| Databáze: | OpenAIRE |
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