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Nonlinear polarization in nitrides revealed with hydrostatic pressure
- Source :
- physica status solidi (b). 235:238-247
- Publication Year :
- 2003
- Publisher :
- Wiley, 2003.
-
Abstract
- We use hydrostatic pressure as an instrument to reveal a strong nonlinearity of the electrical polarization in group-III nitride quantum well structures. From the photoluminescence peak energies of the quantum well emission at different applied pressures we obtain the values of the built-in electric field in the wells and the corresponding well-barrier polarization difference. We found that in both the InGaN/GaN and GaN/AlGaN systems the field and the polarization difference increase with pressure much faster than expected from the conventional (linear) model of polarization. This behavior is explained by the dramatic strain dependence of the piezoelectric coefficients of the group-III nitrides, which constitutes the nonlinear piezoelectric effect.
- Subjects :
- Photoluminescence
Condensed matter physics
Linear polarization
business.industry
Chemistry
Hydrostatic pressure
Nitride
Condensed Matter Physics
Polarization (waves)
Piezoelectricity
Electronic, Optical and Magnetic Materials
Condensed Matter::Materials Science
Optics
Electric field
business
Quantum well
Subjects
Details
- ISSN :
- 15213951 and 03701972
- Volume :
- 235
- Database :
- OpenAIRE
- Journal :
- physica status solidi (b)
- Accession number :
- edsair.doi...........cbbc26485cb11df51696f36774165a96
- Full Text :
- https://doi.org/10.1002/pssb.200301563