Journal
PHYSICAL REVIEW B
Volume 94, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.94.035148
Keywords
-
Funding
- Deutsche Forschungsgemeinschaft [Sonderforschungsbereich 762]
- Austrian Fond zur Forderung der Wissenschaftlichen Forschung [SFB25]
Ask authors/readers for more resources
We apply a generalized model for the determination and analysis of the dielectric function of optically anisotropic materials with color dispersion to phonon modes and show that it can also be generalized to excitonic polarizabilities and electronic band-band transitions. We take into account that the tensor components of the dielectric function within the Cartesian coordinate system are not independent of each other but are rather projections of the polarization of dipoles oscillating along directions defined by the, non-Cartesian, crystal symmetry and polarizability. The dielectric function is then composed of a series of oscillators pointing in different directions. The application of this model is exemplarily demonstrated for monoclinic (beta-phase) Ga2O3 bulk single crystals. Using this model we are able to relate electronic transitions observed in the dielectric function to atomic bond directions and orbitals in the real space crystal structure. For a thin film revealing rotational domains we show that the optical biaxiality is reduced to uniaxial optical response.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available