SPIN RESPONSE OF UNPOLARIZED QUANTUM DOTS

The spin response function for electrons confined in a quantum dot is studied within the time-dependent local spin density approximation (TD LSDA) of density functional theory. In the long-wavelength regime we p redict the existence of a low-energy collective dipole (l = 1) spin mo de. The evolution with electron number of the spin response is studied and compared with that of the density response. Predictions for the s tatic dipole polarizability are given.