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- W1486162574 abstract "We calculate the third-order nonlinear optical susceptibility, ${mathrm{ensuremath{chi}}}^{(3)}$, of the GaAs/${mathrm{Ga}}_{0.7}$${mathrm{Al}}_{0.3}$As superlattice by determining the enhanced band nonparabolicity in the superlattice growth direction. A four-band kensuremath{cdot}p model is used for the band structure of the bulk semiconductors, and the superlattice conduction minibands are obtained using a transfer-matrix method developed earlier. Estimates for ${mathrm{ensuremath{chi}}}^{(3)}$, averaged over the Fermi distribution of energies, are made at T=0 K and at room temperature. The calculations are performed for a number of representative values for carrier concentrations in the conduction minibands and for various layer thicknesses. In-plane nonparabolicity is incorporated, and no approximations are made for the Fermi distribution of carriers over the lowest and the first excited minibands. For the GaAs/${mathrm{Ga}}_{1mathrm{ensuremath{-}}mathit{x}}$${mathrm{Al}}_{mathit{x}}$As superlattice it is found that the in-plane nonparabolicity has a negligible effect on ${mathrm{ensuremath{chi}}}^{(3)}$ both at T=0 and 300 K. For T=0 K, a superlinear behavior of ${mathrm{ensuremath{chi}}}^{(3)}$ with carrier concentration is obtained for Fermi energies near the top of the lowest miniband. We find that significant contributions to ${mathrm{ensuremath{chi}}}^{(3)}$ occur from the first excited miniband in the case of wide wells, and that the magnitude of ${mathrm{ensuremath{chi}}}^{(3)}$ is enhanced for wider wells and/or barriers." @default.
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- W1486162574 title "Nonlinear optical properties of GaAs/<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Ga</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi mathvariant=normal>−</mml:mi><mml:mi mathvariant=italic>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Al</mml:mi></mml:mrow><…" @default.
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- W1486162574 doi "https://doi.org/10.1103/physrevb.42.7124" @default.
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