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Dielectric tensor of monoclinic Ga2
single crystals in the spectral range 0.5–8.5 eV
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tensor of Ga2O3 in the monoclinic (β) phase was determined by generalized spectroscopic ellipsometry in a wide spectral range from 0.5 eV to 8.5 eV as well as by density functional theory calculations combined with many-body perturbation theory including quasiparticle and excitonic effects. The dielectric
tensors obtained by both methods are in excellent agreement with each other and the observed transitions in the dielectric function are assigned to the corresponding valence bands. It is shown that the off-diagonal element of the dielectric
tensor reaches values up to |ε
| ≈ 0.30 and cannot be neglected. Even in the transparent spectral range where it is quite small (|ε
| < 0.02) it causes a rotation of the dielectric axes around the symmetry axis of up to 20°.
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