Ultrafast Dynamics of Optically-Induced Charge and Spin Currents in Semiconductors

摘要: The ultrafast dynamics of optical excitations in semiconductors and semiconductor nanostructures can be computed on a microscopic theoretical basis using the Bloch equations. This set equations allows one to nonperturbatively evaluate light-field-induced intraband interband is also well suited for analysis many-body effects such as excitonic resonances carrier-carrier carrier-phonon scattering processes. In this article we start with description an experimental observation coherent spin photocurrents, then briefly introduce approach review some results our theory concerning generation temporal decay charge currents nanostructures. transients show enhanced damping current relative consequence Coulomb between carriers opposite spin. influence quantum kinetic memory photocurrents analyzed by evaluating terms beyond Markov approximation.