Unusual phonon mode behaviour in zinc‐blende BN/GaN superlattices
| Autor: | Andrew F. Zhou, Devki N. Talwar, Tzuen-Rong Yang |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Condensed matter physics Phonon business.industry Superlattice Mode (statistics) chemistry.chemical_element Zinc Condensed Matter Physics Spectral line Condensed Matter::Materials Science symbols.namesake Optics chemistry symbols Oblique incidence Anisotropy Raman spectroscopy business |
| Zdroj: | physica status solidi c. 12:430-433 |
| ISSN: | 1610-1642 1862-6351 |
| DOI: | 10.1002/pssc.201400157 |
| Popis: | Comprehensive calculations of the long-wavelength optical phonons are reported for zinc-blende BN films by exploiting a linear response theory to simulate far-infrared reflectivity and transmission spectra at oblique incidence. A rigid-ion-model is used to study the lattice dynamics of the unconventional BN/GaN short-period superlattices (SLs). Besides empathizing, the anisotropic mode behaviour of optical phonons, the study has offered evidence of acoustic-mode anti-crossing, mini-gap formation, confinement, as well as BN-like modes falling between the gap regions separating the optical phonons of the two bulk (BN, GaN) semiconductor materials. A bond-polarizability approach within the second-nearest-neighbour linear-chain model is also employed to visualize the Raman intensity profiles of the short-period BN/GaN SLs, revealing major trends of the phonon characteristics noted in many conventional SLs, while eliciting some interesting contrasts. (© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) |
| Databáze: | OpenAIRE |
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