Exciton spin precessions in a biased double quantum dot

We investigated the electric field effects on the spin precessions of excitons in a double quantum dot embedded in a semiconductor nanowire under an applied magnetic field. The electric field moves the carriers in the dots along the nanowire axis, modifying their confinement and therefore the effective g factors and the electron-hole exchange interaction. We obtain the time evolution of the excitonic spin and show, from the spin precession spectra, how the applied electric field affects the excitonic spin dynamics. © 2006 American Institute of Physics.