Microscopic theory of optical nonlinearities and spontaneous emission lifetime in group-III nitride quantum wells

W. Chow, M. Kira, Stephan W Koch

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Microscopic calculations of the absorption and luminescence spectra are presented for wide bandgap Ga1-xInxN/GaN quantum well systems. Whereas structures with narrow well widths exhibit the usual excitation-dependent bleaching of the exciton resonance without shifting spectral position, a significant blueshift of the exciton peak is obtained for wider quantum wells. This blueshift, which is also present in the excitation-dependent luminescence spectra, is attributed to the interplay between the screening of a strain induced piezoelectric field and the density dependence of many-body Coulomb effects. The calculations also show an over two orders of magnitude increase in the spontaneous electron-hole-pair lifetime with well width, due to the reduction of the electron-hole wave function overlap in the wider wells. The resulting decrease in spontaneous emission loss is predicted to lead to improved threshold properties in wide quantum well lasers.

Original languageEnglish (US)
Pages (from-to)1947-1952
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number3
Publication statusPublished - 1999
Externally publishedYes


ASJC Scopus subject areas

  • Condensed Matter Physics

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