Dresden 2003 – wissenschaftliches Programm
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MA: Magnetismus
MA 14: Poster: Schichten(1-31), Spinabh.Trsp.(32-47), Exch.Bias(48-54), Spindyn.(55-64), Mikromag.(65-76), Partikel(77-88), Oflmag.(89-92), Spinelektr.(93-98), Elektr.Theo.(99-103), Mikromag+PhasÜ+Aniso.(104-122), MagnMat.(123-134), Messm+Mol-Mag.(135-139), Kondo(140-151)
MA 14.62: Poster
Dienstag, 25. März 2003, 15:15–19:15, Zelt
Spin Dynamics in Nonlinear Optics of a 3-Dimensional Electron Gas — •Torsten Andersen1, Ole Keller2, Wolfgang Hübner3, and Börje Johansson1 — 1Condensed Matter Theory Group, Department of Physics, Ångström Laboratory, Uppsala University, Box 530, S–751 21 Uppsala, Sweden — 2Institute of Physics, Aalborg University, Pontoppidanstræde 103, DK–9220 Aalborg Øst, Denmark — 3Department of Physics, Kaiserslautern University, Box 3049, D–67653 Kaiserslautern, Germany
A novel signature of the electron spin on the nonlinear (second-harmonic) optical response of an electronic system is predicted. Starting from the nonrelativistic Pauli Hamiltonian, we present the influence of the electron spin on the nonlinear optical response of a 3-dimensional (homogeneous) electron gas in the low-temperature limit. The theoretical model is fully nonlocal, and the spin signature is a pure nonlocal effect in the homogeneous electron gas, and not related to the spin-orbit interaction. We show by looking at the longitudinal second-harmonic response from a transverse incoming field at the fundamental frequency, that a distinct difference in the response appears when spin is included in the formalism, compared to the traditional paramagnetic-only response. Finally, we show that the effect is present also in the case where screening is included.