Excited State Dynamics

excited states diagramCHALLENGE AND OPPORTUNITY

Excited-state nanophotonics presents a critical challenge and opportunity as it involves competing degrees of freedom and constraints with coupled electrons, photons, and atomic structures. Properties that emerge from correlations between these atomic, electronic and photonic phenomena determine the intermediate length and time scales that can be exploited in applications ranging from quantum information to photocatalysis, and for the design of novel functional materials with tailored optoelectronic properties.

In particular, electron-photon, electron-electron as well as electron-phonon dynamics and far-from-equilibrium transport are critical to describe ultrafast and excited-state optoelectronic interactions in materials. Therefore, we are working on new and efficient theory methods to calculate arbitrary electron-phonon and electron-optical interactions in a Feynman diagram many-body framework integrated with a nonequilibrium carrier transport method.

Specific projects include:

  • Quantum simulations of dynamics in 2D and 3D materials using a Wannier-function approach. Here's a recent paper (on arXiv) where we study dynamics and spin-locking in 2D transition metal dichalcogenides.
  • Parameter-free descriptions of ultrafast measurements of nanostructures, including temperature-dependent dielectric functions.
  • Calculations of defects in materials particularly those that could act as single photon emitters. Here's a recent paper (on arXiv) where we predict and in collaboration with experimental colleagues verify the Pb-related defects in diamond.