Wavelength dependent coherent phonon spectroscopy of Ca₂RuO₄

Ca₂RuO₄ is a multi-band Mott insulator featuring complex magnetic and orbital ordered states as a function of temperature. We conducted wavelength- and temperature-dependent time-resolved optical reflectivity measurements on Ca₂RuO₄ to study how optically excited coherent phonons interact with these ordered states. I will also present a microscopic model we developed to understand the dynamics of the coupled lattice and electronic order parameters.