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- W2019914843 abstract "The first nonperturbative calculation of optical absorption by a hydrogenic impurity in an electric field including transition-matrix elements is presented. A nonperturbative method developed by Duke and Alferieff to treat the effects of an electric field on excitons is applied to shallow donor impurity states. The model potential consists of the Coulomb potential near the origin and a uniform electric field potential far from the origin. The potential switches from the Coulomb to the electric field potential at a crossover boundary. We show that the calculated absorption spectrum is strongly dependent on the choice of the crossover boundary and introduce a new choice for the crossover boundary. Using this new definition we calculate the absorption spectrum for both excitons and impurity states. The results closely resemble the experimental data. We also show that Elliot's approximation for optical absorption in excitons can be applied to shallow donor impurities at low electric fields." @default.
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- W2019914843 date "1988-11-15" @default.
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- W2019914843 title "Electric field effects on excitons and shallow donor impurities" @default.
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- W2019914843 doi "https://doi.org/10.1103/physrevb.38.9686" @default.
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