Resonant indirect optical absorption in germanium

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DOIResolve DOI: http://doi.org/10.1103/PhysRevB.96.121201
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  1. National Research Council Canada. Measurement Science and Standards
TypeArticle
Journal titlePhysical Review B
ISSN2469-9950
2469-9969
Volume96
Issue12
Abstract
The optical absorption coefficient of pure Ge has been determined from high-accuracy, high-precision optical measurements at photon energies covering the spectral range between the indirect and direct gaps. The results are compared with a theoretical model that fully accounts for the resonant nature of the energy denominators that appear in perturbation-theory expansions of the absorption coefficient. The model generalizes the classic Elliott approach to indirect excitons, and leads to a predicted optical absorption that is in excellent agreement with the experimental values using just a single adjustable parameter: the average deformation potential DΓL coupling electrons at the bottom of the direct and indirect valleys in the conduction band. Remarkably, the fitted value, DΓL=4.3×108eV/cm, is in nearly perfect agreement with independent measurements and ab initio predictions of this parameter, confirming the validity of the proposed theory, which has general applicability.
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PublisherAmerican Physical Society
LanguageEnglish
Peer reviewedYes
NPARC number23002340
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Record created2017-10-20
Record modified2017-10-20
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