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Optical Response of Two-Dimensional Electron Fluids Beyond the Kohn Regime: Strong Nonparabolic Confinement and Intense Laser Light
We investigate the linear and nonlinear optical response of two-dimensional interacting electron fluids confined by a strong nonparabolic 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 nonlinear effect). …