| Pressure Dependence of Elastic Constants in Zinc-Blende III--N and Their Influence on the Light Emission in Nitride Heterostructures |
| S.P. £epkowski a and J.A. Majewski b a Unipress, High Pressure Research Center Polish Academy of Sciences, Soko³owska 29, 01-142 Warszawa, Poland b Walter Schottky Institute, Technische Universität München, Garching, Germany |
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| We studied the nonlinear elasticity effects for the case of III--N compounds. Particularly, we determined the pressure dependences of elastic constants, in zinc-blende InN, GaN, and AlN by performing ab initio calculations in the framework of plane-wave pseudopotential implementation of the density-functional theory. We found significant and almost linear increase in C 11 , C 12 with pressure for considered nitrides compounds. Much weaker dependence on pressure was observed for C 44 . We also discussed pressure dependences of two-dimensional Poisson's ratio and elastic anisotropy coefficient. Finally, we showed that the pressure dependence of elastic constants results in significant reduction of the pressure coefficient of the energy emission in cubic InGaN/GaN quantum wells and essentially improves the agreement between experimental and theoretical values. |
| DOI: 10.12693/APhysPolA.105.559 PACS numbers: 62.20.Dc, 62.50.+p |