Paper 14092-99
Paper 14092-99
High-harmonic spectroscopy probes the anisotropic charge-density-wave strengths of TiSe2
On demand | Presented live 14 April 2026 
Abstract
Through high harmonic generation as a sensitive probe for electronic and structural properties we investigate the charge density wave phase transition of TiSe2. Signatures of the different material phases are found in the reflectivity and driven harmonics, identifying the transition temperature all optically. At temperatures below 100 K anisotropy in the non-linear response emerges and is identified via our developed mean-field model as an asymmetric atom displacement from directional CDW strength. Such displacement is one way to realize a chiral CDW phase.
Presenter
Igor Tyulnev
ICFO - Institut de Ciencies Fotoniques (Spain)
Igor Tyulnev completed his undergraduate studies at the Center for Free-Electron-Laser Science (CFEL) in Hamburg where he received his Bachelor of Science in Physics in 2016 for the growth and characterization of 2D materials. In 2019 he obtained the Master of Science in Physics for the simulation of nonlinear few-cycle pulse propagation. Since 2020 he has been enrolled at ICFO - The Institute of Photonic Sciences where he joined the Attosecond and Ultrafast Optics group of Prof. Dr. Biegert where he completed his doctoral studies. His research focus is the investigation of structural dynamics and phase transitions in solids through nonlinear strong-field techniques.
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