6533b831fe1ef96bd1298e51
RESEARCH PRODUCT
Pressure dependence of the refractive index in wurtzite and rocksalt indium nitride
Alfredo SeguraJordi IbáñezYasushi NanishiR. OlivaR. OlivaTomohiro YamaguchiLuis Artússubject
Materials scienceIndium nitridePhysics and Astronomy (miscellaneous)Condensed matter physicsBand gapHydrostatic pressureRefractive indexDielectricHigh pressureCondensed Matter::Materials Sciencechemistry.chemical_compoundchemistryBand gapPhononsCritical point phenomenaThin filmElectronic band structureRefractive indexWurtzite crystal structuredescription
We 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-12-08 | Applied Physics Letters |