Understanding the complex interactions associated with charge, spin, lattice and orbital degrees of freedom is fundamental for emerging applications of quantum materials. In this context, ultrafast optical spectroscopy systems are promising tools to study the origin of complex orders. Here, an intense optical pulse brings the system out-of-equilibrium, providing an excellent opportunity to distinguish the dynamics of each subsystem. Using ultrafast techniques, we investigated charge density wave (CDW) behavior in transition-metal dichalcogenides (TMDs) after photo-excitation and during the relaxation time. To unravel the mechanisms underlying the correlations in CDW systems, we combined time resolved re ectivity (TRR) and time and angle resolved photoemission spectroscopy (TARPES). Our approach provides clear evidence of the phononic contribution to CDW phenomena in 1T-TiSe2.
The spin dynamics triggered by an ultrashort optical excitation can lead to a variety of behaviors depending on the
specific spin and electronic structure of the material. In metallic films, electron-quasiparticles (phonons and magnons)
interactions takes place on sub-picosecond timescale and demagnetization is established within 100 fs. In half-metal
oxides, spin dynamics is much slower (100 ps) due to the inhibition of spin-flip processes. Furthermore, the dynamics of
magnetic anisotropies can be exploited to control the magnetization in ferromagnets. Optically-induced reversible
switching of the magnetization has been recently demonstrated in thin magnetic layers on the 100 picoseconds timescale.
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