Origin of symmetric STM images for the asymmetric atomic configuration on GaAs(001)–c(4×4)α surfaces
| Autor: | Junji Yoshino, Jun Nakamura, Kazuma Yagyu, Shigeru Kaku |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Electron density
Materials science Surfaces and Interfaces Electronic structure Condensed Matter Physics Molecular physics C-4 Surfaces Coatings and Films law.invention Condensed Matter::Materials Science Crystallography Atomic configuration Atomic orbital law Simple (abstract algebra) Materials Chemistry Scanning tunneling microscope Electron counting |
| Zdroj: | Surface Science. 625:84-89 |
| ISSN: | 0039-6028 |
| DOI: | 10.1016/j.susc.2014.03.014 |
| Popis: | The empty-state scanning tunneling microscopy (STM) images of GaAs-c(4 × 4)α show symmetric features at positive biases, contrary to the naive prediction based on electron counting model. In this paper, we report that STM simulations based on first-principles electronic structure calculations successfully demonstrate symmetric images consistent with the STM observations. Furthermore, simple analysis has revealed that the origin of the symmetric images is the combined local electron density of multiple orbitals, and is essentially different from those on GaAs–c(4 × 4)β surfaces. |
| Databáze: | OpenAIRE |
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