Drive versus Quench – Studying Novel Photonic States of Matter or Elementary Excitations in Superconductors by Time-Resolved Spontaneous Raman Scattering

Abstract: There are two fundamentally different ways to carry out a time resolved inelastic light scattering experiment: Firstly, one can drive elementary excitations and form new photonic states of matter not intrinsic to the ground state of the investigated material. Secondly, we can quench the free energy “Mexican-Hat Potential” of order in condensed matter leading to the population of the lowest-energy stable excitation characteristic for the ordered state. In my talk I will present two examples outlining these different inelastic light scattering techniques: Drive - forming novel vibronic states in bilayer-graphene; Quench – studying the Higgs excitation in superconductors