Multidimensional coherent spectroscopy is a technique based on non-linear light-matter interaction that provides qualitatively new information that is otherwise inaccessible through conventional spectroscopic tools that primarily measure the linear response. 2D optical spectroscopy, for example, can be used to directly measure the anharmonicity of a collective mode and coupling between resonant excitations. It can also distinguish between homogenous and inhomogeneous broadening of spectral features. I will introduce the general notion of multidimensional coherent spectroscopy and its implementation and applications at THz frequencies (~meV energy scales) in condensed matter systems such as anti-ferromagnets, electron glasses, superconductors and so on.
Note: this event will be hybrid. The live talk occuring in Loomis 276 will be simultaneously broadcast via Zoom. The Zoom link will be sent to the Graduate Student and PDRA mailing lists. If you are not on one of those lists and are interested in attending, please email Caitlin at ckengle2@illinois.edu for the link.