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Título

Pressure dependence of the refractive index in wurtzite and rocksalt indium nitride

AutorOliva, Ramón; Segura, A.; Ibáñez Insa, Jordi ; Yamaguchi, T.; Nanishi, Y.; Artús, Lluís
Palabras claveHigh pressure
Phonons
Critical point phenomena
Band gap
Refractive index
Fecha de publicación2014
EditorAmerican Institute of Physics
CitaciónApplied Physics Letters 105 (2014)
ResumenWe have performed high-pressure Fourier transform infrared reflectance measurements on a freestanding InN thin film to determine the refractive index of wurtzite InN and its high-pressure rocksalt phase as a function of hydrostatic pressure. From a fit to the experimental refractive-index curves including the effect of the high-energy optical gaps, phonons, free carriers, and the direct (fundamental) band-gap in the case of wurtzite InN, we obtain pressure coefficients for the lowfrequency (electronic) dielectric constant e1 . Negative pressure coefficients of -8.8 × 10-2 GPa-1 and -14.8 × 10-2 GPa-1 are obtained for the wurtzite and rocksalt phases, respectively. The results are discussed in terms of the electronic band structure and the compressibility of both phases.
URI10261/129546
DOI10.1063/1.4903860
Identificadoresdoi: 10.1063/1.4903860
issn: 0003-6951
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