Speaker
Description
High harmonic spectroscopy (HHS) has emerged as a powerful all-optical probe of ultrafast electronic and lattice dynamics in solids. I will present how time-resolved HHS can be used to study coherently driven phonons in the type-II Weyl semimetal WTe$_2$. Following ultrafast near-infrared excitation, coherently launched lattice oscillations modulate the electronic band structure and, in turn, leave distinct fingerprints in the high harmonic radiation that is emitted under intense mid-infrared driving. These phonon-induced modulations of the harmonic yield provide femtosecond-resolved, momentum-dependent insight into electron–phonon coupling and nonequilibrium band dynamics. Our results establish HHS as a sensitive spectroscopic tool for tracking ultrafast lattice-driven electronic structure changes in quantum materials.
| Keyword-1 | high harmonic spectroscopy |
|---|---|
| Keyword-2 | quantum materials |
| Keyword-3 | coherent phonons |