We investigate quasi-particle, spin, and valley dynamics in semiconductor quantum structures, focusing on transition-metal dichalcogenides such as MoS?, MoSe?, WS?, WSe?, and their van der Waals heterostructures. Our experimental toolkit includes time- and spatially-resolved Kerr and Faraday rotation, time-resolved photoluminescence, Raman spectroscopy, and four-wave mixing. These measurements are typically performed at low temperatures, and when required, under high magnetic fields.
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