Computation of the lattice dynamics for the low-coverage Au/Cu(111) ordered metallic surface alloy system
| Autor: | Rabah Chadli, A. Khater, Bilal Menguelti |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Surface (mathematics) Materials science Condensed matter physics Phonon Alloy Resonance 02 engineering and technology Surface phonon engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Brillouin zone Condensed Matter::Materials Science Phase (matter) 0103 physical sciences engineering Electrical and Electronic Engineering 0210 nano-technology Dispersion (water waves) |
| Zdroj: | Physica B: Condensed Matter. 606:412822 |
| ISSN: | 0921-4526 |
| DOI: | 10.1016/j.physb.2021.412822 |
| Popis: | The lattice dynamics of the ordered Au/Cu(111) surface alloy system are investigated, in particular for the low-coverage ordered Cu(111)-Au 3 × 3 R30° surface alloy structure. The computations are developed using the phase field matching theory (PFMT) and the Green's functions (GF) formalism. Dispersion branches for surface phonons and resonances along the directions of high symmetry Γ M ‾ , M K ‾ , and K Γ ‾ of the two-dimensional (2D) surface Brillouin zone (BZ) of the system, are computed. The vibration local densities of states (LDOS) are also determined for representative atomic sites at the surface alloy boundary. The lattice dynamics of the Cu(111)-Au 3 × 3 R30° surface reveal novel surface phonon and resonance dispersion branches that could be of potential interest for electronic, chemical, and spintronic applications, notably via electron-phonon interactions at this surface. |
| Databáze: | OpenAIRE |
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