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Optical response of two-dimensional electron fluids beyond the Kohn regime: strong non-parabolic confinement and intense laser light

M. Santer·B. Mehlig·M. Moseler
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Abstract

We investigate the linear and non-linear optical response of two-dimensional (2D) interacting electron fluids confined by a strong non-parabolic potential. We show that such fluids may exhibit higher-harmonic spectra under realistic experimental conditions. Higher harmonics arise as the electrons explore anharmonicities of the confinement potential (electron-electron interactions reduce this non-linear effect). This opens the possibility of controlling the optical functionality of such systems by engineering the confinement potential. Our results were obtained within time-dependent density-functional theory, employing the adiabatic local-density approximation. A classical hydrodynamical model is in good agreement with the quantum-mechanical results.

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M. Santer, B. Mehlig, M. Moseler. 2002-09-06. Optical response of two-dimensional electron fluids beyond the Kohn regime: strong non-parabolic confinement and intense laser light. https://doi.org/10.1103/physrevlett.89.286801

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