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Título: | High-pressure optical absorption in InN: Electron density dependence in the wurtzite phase and reevaluation of the indirect band gap of rocksalt InN |
Autor: | Ibáñez Insa, Jordi CSIC ORCID ; Segura, A.; García-Domene, B.; Oliva, Ramón; Manjón, F. J.; Yamaguchi, T.; Nanishi, Y.; Artús, Lluís CSIC ORCID | Fecha de publicación: | jul-2012 | Editor: | American Physical Society | Citación: | Physical Review B 86: 035210 (2012) | Resumen: | We report on high-pressure optical absorption measurements on InN epilayers with a range of free-electron concentrations (5×1017–1.6×1019 cm−3) to investigate the effect of free carriers on the pressure coefficient of the optical band gap of wurtzite InN. With increasing carrier concentration, we observe a decrease of the absolute value of the optical band gap pressure coefficient of wurtzite InN. An analysis of our data based on the k·p model allows us to obtain a pressure coefficient of 32 meV/GPa for the fundamental band gap of intrinsic wurtzite InN. Optical absorption measurements on a 5.7-μm-thick InN epilayer at pressures above the wurtzite-to-rocksalt transition have allowed us to obtain an accurate determination of the indirect band gap energy of rocksalt InN as a function of pressure. Around the phase transition (∼15 GPa), a band gap value of 0.7 eV and a pressure coefficient of ∼23 meV/GPa are obtained. | Versión del editor: | http://dx.doi.org/10.1103/PhysRevB.86.035210 | URI: | http://hdl.handle.net/10261/96846 | DOI: | 10.1103/PhysRevB.86.035210 | ISSN: | 1098-0121 | E-ISSN: | 1550-235X |
Aparece en las colecciones: | (Geo3Bcn) Artículos |
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Ibañez 2012 Phys Rev B 86 035210.pdf | 338,58 kB | Adobe PDF | Visualizar/Abrir |
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