Event Details

The fundamental difference between electrons in a solid and those in high-energy physics is the absence of Poincare symmetry in lattice systems. This gives rise to a much larger number of possible low energy excitations (known as multi-fold fermions) in solid-state physics. Recent theory and experiments show that semimetals with three-fold degeneracies can exist in nonmagnetic materials with chiral crystal structures. In my talk, I would like to discuss how do we use light to probe these low-energy excitations near the three-fold degenerate points by linear and nonlinear optical conductivity measurements.