Effective transient states for nonequilibrium charge density wave systems under ultrafast control pulses

A central challenge for implementing Mott-insulator transition in nonequilibruim ~time-dependent charge density wave systems is finding an effective pulse to achieve the goal. Effective ultra laser pulses have been found for the transient states in nonequilibruim~~time-dependent charge density wave systems based on a promising optimal-control method. ~Intense ultrafast laser pulses allow the preparation of transient states of~~matter exhibiting strong non-equilibrium between electrons and lattice. By~controlling the laser pulse, we are able to change the transient states of these~quantum systems. The optical and structural properties as well as the temporal~evolution of such states provide insight into the mutual dependence of electronic~and atomic structure.~ We approach the problem by showing examples from charge-density-wave~systems. Nonequilibrium techniques can be used to qualitatively describe the common short-time experimental features. Through simulations based~on non-equilibrium Green's function formalism we show how to achieve effective transient states for nonequilibrium systems under ultrafast control pulses.