The Higgs mode in a superconductor is a collective oscillation of the amplitude of its superconducting order parameter. In 2H-NbSe₂, where superconductivity coexists with charge-density-wave order, Raman spectroscopy reveals a peak commonly attributed to this mode. Yet its observation in the E₂g symmetry channel remains difficult to explain. Could this signal reveal pair-density-wave superconductivity, an unconventional state in which Cooper pairs carry finite momentum? This Master’s internship will explore this possibility through analytical calculations and numerical modelling. You will develop a microscopic model, investigate its symmetries and collective excitations, and calculate Raman spectra for comparison with experiments. The project offers an opportunity to develop skills in many-body theory and superconductivity while tackling an open question connecting fundamental physics with experimental observations. The internship will take place at the Max Planck Institute for Solid State Research in Stuttgart, Germany.