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• W2060827848 endingPage "5352" @default.
• W2060827848 startingPage "5337" @default.
• W2060827848 abstract "We present a new general formalism for investigating the second-order optical response of solids, and illustrate it by deriving expressions for the second-order susceptibility tensor ${ensuremath{chi}}_{2}(ensuremath{-}{ensuremath{omega}}_{ensuremath{Sigma}};{ensuremath{omega}}_{ensuremath{beta}},{ensuremath{omega}}_{ensuremath{gamma}}),$ where ${ensuremath{omega}}_{ensuremath{Sigma}}={ensuremath{omega}}_{ensuremath{beta}}+{ensuremath{omega}}_{ensuremath{gamma}},$ for clean, cold semiconductors in the independent particle approximation. Based on the identification of a polarization operator $mathbf{P}$ that would be valid even in a more complicated many-body treatment, the approach avoids apparent, unphysical divergences of the nonlinear optical response at zero frequency that sometimes plague such calculations. As a result, it allows for a careful examination of $mathit{actual}$ divergences associated with physical phenomena that have been studied before, but not in the context of nonlinear optics. These are (i) a coherent current control effect called ``injection current,'' or ``circular photocurrent,'' and (ii) photocurrent due to the shift of the center of electron charge in noncentrosymmetric materials in the process of optical excitation, called ``shift current.'' The expressions we present are amenable for numerical calculations, and we demonstrate this by performing a full band-structure calculation of the shift current coefficient for GaAs." @default.
• W2060827848 created "2016-06-24" @default.
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• W2060827848 date "2000-02-15" @default.
• W2060827848 modified "2023-10-09" @default.
• W2060827848 title "Second-order optical response in semiconductors" @default.
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• W2060827848 doi "https://doi.org/10.1103/physrevb.61.5337" @default.
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