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

作者: H. Y. Peng , M. D. McCluskey , Y. M. Gupta , M. Kneissl , N. M. Johnson

DOI: 10.1103/PHYSREVB.71.115207

关键词:

摘要: The band-gap shift of GaN has been examined as a function uniaxial compression along the $c$ axis using time-resolved, optical absorption measurements in shock wave experiments. hydrostatic deformation potential ${a}_{cz}\ensuremath{-}{D}_{1}$ (parallel to axis), determined independently from ${a}_{ct}\ensuremath{-}{D}_{2}$ (perpendicular axis). Based on experimental results, set potentials obtained: ${a}_{cz}\ensuremath{-}{D}_{1}=\ensuremath{-}9.6\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$, ${a}_{ct}\ensuremath{-}{D}_{2}=\ensuremath{-}8.2\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$, ${D}_{3}=1.9\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$, and ${D}_{4}=\ensuremath{-}1.0\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$. These values indicate that wurtzite are anisotropic.

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