Two-dimensional electron gases induced by spontaneous and piezoelectric polarization charges in N- and Ga-face AlGaN/GaN heterostructures

Ambacher, O.; Smart, J.; Shealy, J. R.; Weimann, N. G.; Chu, K.; Murphy, M.; Schaff, W. J.; Eastman, L. F.; Dimitrov, R.; Wittmer, L.; Stutzmann, M; Rieger, W.; Hilsenbeck, J.

doi:10.1063/1.369664

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Two-dimensional electron gases induced by spontaneous and piezoelectric polarization charges in N- and Ga-face AlGaN/GaN heterostructures

Author(s): O. Ambacher , J. Smart , J. R. Shealy , N. G. Weimann , K. Chu , M. Murphy , W. J. Schaff , L. F. Eastman , R. Dimitrov , L. Wittmer , M. Stutzmann , W. Rieger , J. Hilsenbeck

Publication date Created: March 15 1999

Publication date (Print): March 15 1999

Journal: Journal of Applied Physics

Publisher: AIP Publishing

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Spontaneous polarization and piezoelectric constants of III-V nitrides

Vincenzo Fiorentini, Fabio Bernardini, David Vanderbilt (1997)

The spontaneous polarization, dynamical Born charges, and piezoelectric constants of the III-V nitrides AlN, GaN, and InN are studied ab initio using the Berry phase approach to polarization in solids. The piezoelectric constants are found to be up 10 times larger than in conventional III-V's and II-VI's, and comparable to those of ZnO. Further properties at variance with those of conventional III-V compounds are the sign of the piezoelectric constants (positive as in II-VI's) and the very large spontaneous polarization.