Abstract:

Spectroscopy provides us a window into the quantum dynamics of system. Traditionally, we focus upon the transition frequencies since this reveals the energy eigenspectrum and details of the symmetry and structure of the system we are trying to study. And for most purposes, this is sufficient. However, the spectral line shape provides us an additional window into the environment surrounding the system. In my colloquium, I'll discuss a general theory of spectral line shapes and in particular discuss our recent efforts into understanding how non-stationary/non-equilibrium many-body effects are manifest in multi-dimensional/ultrafast spectroscopy--especially when applied to semiconducting systems. I will highlight our theoretical efforts against recent experimental work on layered perovskites.

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**Refreshments will be served in the Olin lobby beginning at 3:30 pm