All articles tagged with #high harmonic spectroscopy
Researchers have used high-harmonic spectroscopy to observe ultrafast electron dynamics in liquids, revealing how specific molecular interactions, like hydrogen bonding, can disrupt electron motion and suppress light emission, with potential implications for chemistry and biology.
Researchers from Huazhong University of Science and Technology have successfully measured the speed of molecular charge migration (CM) in a carbon-chain molecule using a high harmonic spectroscopy (HHS) method. By reconstructing the CM dynamics at the most fundamental level, the team achieved a temporal resolution of 50 attoseconds and quantified the CM speed to be several angstrom per femtosecond. The study provides valuable insights into CM dynamics in molecules and opens up possibilities for manipulating chemical reactions by controlling CM speed through molecular alignment.
Theoretical physicists at the Max Planck Institute for the Structure and Dynamics of Matter in Germany have conducted the first ab initio investigation of high harmonic generation from topological insulators and found no evidence of universal topological signatures. Their study challenges the assumption that topological information can be extracted from the emitted spectra. Instead, they suggest that non-topological aspects of the material, such as crystal structure and band symmetry, dominate the response. While the researchers do not rule out the existence of topological signatures in high harmonic generation, they call for more complex and robust ideas to measure topology through nonlinear optics.