Optical control of magnetization by linearly polarized laser pulses in a crystal with three-fold symmetry

Here, we discuss that the conservation of angular momentum rules the light induced magnetization. In light-magnetization interactions in solids, the balance of angular momentum includes contributions from the light, the magnetization, and the crystalline lattice. In this presentation, we high light the role of the lattice, in that it provides angular momentum in discrete units in correspondence to its rotational symmetry, which is the rotational analogue of the Umklapp process.