title: Optical response of two-dimensional electron fluids beyond the kohn regime: strong nonparabolic confinement and intense laser light.
abstract: 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). This opens the possibility of controlling the optical functionality by engineering the confinement potential. Our results were obtained within time-dependent density-functional theory. A classical hydrodynamical model is in good agreement with the quantum-mechanical results.
authors.affiliation: Theoretical Quantum Dynamics, University of Freiburg, 79104 Freiburg, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Santer
authors.forename: B
authors.initials: B
authors.lastname: Mehlig
authors.forename: M
authors.initials: M
authors.lastname: Moseler