Fig. 2: Exciton migration.
a Time evolution of the current induced by the circularly polarized UV pulse. b Fourier transform of the laser-induced current. Two clear frequency modes are observed corresponding to the 2 p and 2 s exciton energies, which form a superposition, while other exciton states are not excited. Figure c–h show snapshots, at the times indicated in (a) of the excitonic distributions in reciprocal and real space.
