Publications by authors named "Michele Perlangeli"
Article Synopsis
- Dimensionality influences the formation of ordered phases like charge density waves (CDWs), which can affect the topological properties of matter.
- The study focuses on TaSeI, a quasi-one-dimensional material that transitions into an incommensurate CDW phase below 263 K, using advanced time-resolved spectroscopies to analyze its optical properties under selective excitation.
- Findings reveal that excitation methods impact relaxation dynamics differently in metallic and insulating states, emphasizing the importance of delocalized carrier injection in the valence band for probing ordered states, and revealing new insights into the CDW phase's symmetry and characteristics.
Time-resolved optical spectroscopy (TR-OS) has emerged as a fundamental spectroscopic tool for probing complex materials, to both investigate ground-state-related properties and trigger phase transitions among different states with peculiar electronic and lattice structures. We describe a versatile approach to perform polarization-resolved TR-OS measurements, by combining broadband detection with the capability to simultaneously probe two orthogonal polarization states. This method allows us to probe, with femtoseconds resolution, the frequency-resolved reflectivity or transmittivity variations along two mutually orthogonal directions, matching the principal axis of the crystal structure of the material under scrutiny.
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