Two-dimensional electronic spectroscopy

Two-dimensional electronic spectroscopy (2DES) has recently emerged as a powerful approach for studying the electronic structure and ultrafast dynamics of a wide range of systems. 2DES reveals connections between optical excitation at a variable frequency and the response of the system over a wide range of frequencies. These connections are reflected in the diagonal and cross-peak locations and lineshapes of the 2D spectrum, and provide detailed information about the underlying electronic and vibrational structure and dynamics of the system. This article discusses various experimental implementations of 2DES and recent applications of the method to studies of natural and artificial photosynthetic systems, photochemical reactions and many-body interactions in 2D and nanostructured materials.