Theoretical and experimental investigation of optical absorption anisotropy in $\beta$-Ga2O3
| Autor: | Ricci, Francesco, Boschi, Francesco, Baraldi, Andrea, Filippetti, Alessio, Higashiwaki, M., Kuramata, A., Fiorentini, Vincenzo, Fornari, Roberto |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | J. Phys.: Condens. Matter 28, 224005 (2016) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/0953-8984/28/22/224005 |
| Popis: | The question of optical bandgap anisotropy in the monoclinic semiconductor $\beta$-Ga2O3 was revisited by combining accurate optical absorption measurements with theoretical analysis, performed using different advanced computation methods. As expected, the bandgap edge of bulk $\beta$-Ga2O3 was found to be a function of light polarization and crystal orientation, with the lowest onset occurring at polarization in the ac crystal plane around 4.5-4.6 eV; polarization along b unambiguously shifts the onset up by 0.2 eV. The theoretical analysis clearly indicates that the shift of the b onset is due to a suppression of the transition matrix elements of the three top valence bands at $\Gamma$ point. Comment: 11 pages, 5 figures |
| Databáze: | arXiv |
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