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- W2028199439 abstract "Magneto-optical studies have been conducted on two ${mathrm{In}}_{mathit{x}}$${mathrm{Ga}}_{1mathrm{ensuremath{-}}mathit{x}}$As/GaAs superlattices to investigate excitonic transitions at the saddle points formed at ${mathit{q}}_{mathit{z}}$=ensuremath{pi}/d of the superlattice miniband structure. We report on a direct observation of both the E1(ensuremath{Pi})-HH1(ensuremath{Pi}) saddle-point exciton and the indirect E1(ensuremath{Gamma})-HH1(ensuremath{Pi}) excitonic resonance in both perpendicular and parallel magnetic fields, with both features showing perpendicular field-induced (ensuremath{Gamma}-ensuremath{Pi}) mixing in the separate carrier minibands. Theoretical calculations demonstrate highly field- and wave-vector-dependent valence-band g factors, which, because of the small valence-band widths, lead to the inversion of the ${mathit{m}}_{mathit{j}}$=+3/2 E-${mathit{q}}_{mathit{z}}$ dispersion curves at high perpendicular fields. The unusual behavior of the light-hole transitions indicates a large degree of in-plane mixing of the heavy- and light-hole states, which would appear to be closely linked to the observed wave-vector mixing and complex g factors." @default.
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- W2028199439 date "1992-02-15" @default.
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- W2028199439 title "Saddle-point excitons and intraband (Γ-Π) mixing in strained-layer superlattices" @default.
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- W2028199439 doi "https://doi.org/10.1103/physrevb.45.4266" @default.
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