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Shock-induced band gap shift in GaN: anisotropy of the deformation potentials

 

The band-gap shift of GaN has been studied as a function of uniaxial compression along the c-axis using time-resolved, optical absorption measurements in shock wave experiments. The hydrostatic deformation potential acz-D1 (parallel to the c-axis), has been determined independently from act-D2 (perpendicular to the c-axis). Based on the experimental results, a set of deformation potentials has been obtained: acz-D1 = -9.6 eV, act-D2 = -8.2 eV, D3 = 1.9 eV and D4 = -1.0 eV. These values indicate that the deformation potentials in wurtzite GaN are anisotropic.

 
citation

Peng, H. Y.; McCluskey, M. D. ; Gupta, Y. M.; Kneissl, M. A. ; Johnson, N. M. Shock-induced band gap shift in GaN: anisotropy of the deformation potentials. Physical Review B. 2005 March 15; 71 (11): 115207-1-5.