Probing the Response of Two-Dimensional Crystals by Optical Spectroscopy

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Focusing on atomically thin transition metal dichalcogenides, this thesis explores their optical responses, particularly linear and second-order nonlinear susceptibilities. The research not only delves into fundamental material properties but also offers characterization techniques for opto-electronic applications. Additionally, it examines valley physics, demonstrating how magnetic fields can lift valley degeneracy and induce valley polarization. These insights deepen the understanding of valley electronic states and pave the way for advancements in valleytronic technologies using two-dimensional materials.