Spin transmission through quantum dots with strong spin-orbit interaction

Quantum oscillations of the spin conductance through regular and chaotic 2D quantum dots under the varying Rashba spin orbit interaction and at zero magnetic field have been numerically calculated by summing up the spin evolution matrices for classical transmitting trajectories. Fourier analysis of these oscillations showed power spectra strongly dependent on the dot geometry. For narrow rings the spectra are dominated by a single peak in accordance with previous analytic results. In other geometries the spectra are represented by multiple peaks for regular QD and quasicontinuum for chaotic QD.Comment: 10 pages, 5 figure

RAMAN SCATTERING FROM A MOLECULE ADSORBED AT THE METAL SURFACE, THE MOLECULAR CHARGE OSCILLATION MECHANISM

On présente un modèle de diffusion Raman exaltée de surface, dans lequel l'exaltation résulte de la modulation de la réfléctivité par la charge moléculaire totale qui oscille avec la fréquence de vibration. Les oscillations de charge sont dues à la variation périodique de la position du niveau moléculaire.The model for Surface Enhanced Raman Scattering is presented in which the enhancement is a result of reflectivity modulation by the molecular total charge which oscillates with the vibrational frequency. The charge oscillations are caused by the periodical variation in the molecular level position

NON-LOCAL THEORY FOR THE FAR-INFRARED ABSORPTION IN SMALL METAL PARTICLES

On propose une théorie non-locale de l'absorption dans l'infra-rouge lointain dans les petites particules métalliques. On montre que l'absorption magnétique dipolaire dépend fortement de la nature de la diffusion électronique par la limite de la particule. On prédit une importante augmentation de cette absorption pour la réflexion spéculaire des électrons par une surface sphérique ou par une surface consistant en microfacettes orientées au hasard.A nonlocal theory of far-infrared absorption in small metal particles has been proposed. The magnetic-dipole absorption has been shown to depend strongly on the nature of electronic scattering from the particle boundary. A large increase of the magnetic-dipole absorption has been predicted for the specular reflection of electrons from the spherical surface or the surface consisting of randomly oriented microfacets