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- W2244865111 abstract "The intensity of optical absorption close to the edge in semiconductors is examined using band theory together with the effective-mass approximation for the excitons. Direct transitions which occur when the band extrema on either side of the forbidden gap are at the same K, give a line spectrum and a continuous absorption of characteristically different form and intensity, according as transitions between band states at the extrema are allowed or forbidden. If the extrema are at different K values, indirect transitions involving phonons occur, giving absorption proportional to ${(ensuremath{Delta}E)}^{frac{1}{2}}$ for each exciton band, and to ${(ensuremath{Delta}E)}^{2}$ for the continuum. The experimental results on ${mathrm{Cu}}_{2}$O and Ge are in good qualitative agreement with direct forbidden and indirect transitions, respectively." @default.
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- W2244865111 date "1957-12-15" @default.
- W2244865111 modified "2023-10-11" @default.
- W2244865111 title "Intensity of Optical Absorption by Excitons" @default.
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- W2244865111 doi "https://doi.org/10.1103/physrev.108.1384" @default.
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