Research

High-Order Sideband Generation

High-order sideband generation (HSG) is an experimental method developed to peer into the behavior of electronic excitations in semiconductors. By creating excited electron/hole or often exciton populations in a material, then using a strong THz pulse to drive them, we are able to analyze what exactly happens inside a material when these quasi-particles are excited.

Then, by using analysis techniques developed by our theorist Qile Wu, we can reconstruct the wave function and even the effective Hamiltonian of holes inside these materials. With further analysis, we can also distinguish exciton species and the band structure and gap of the materials.