Magnetic dipole and electric quadrupole responses of elliptic quantum dots in magnetic fields

Abstract

The magnetic dipole (M1) and electric quadupole (E2) responses of twodimensional quantum dots with an elliptic shape are theoretically investigated as a function of the dot deformation and applied static magnetic field. Neglecting the electron-electron interaction we obtain analytical results which indicate the existence of four characteristic modes, with different B-dispersion of their energies and associated strengths. Interaction effects are numerically studied within the time-dependent local-spin-density theory, assessing the validity of the non-interacting picture.PACS 73.20.Dx, 72.15.Rn