Regensburg 2025 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 54: Ultra-fast Phenomena II

HL 54.8: Talk

Thursday, March 20, 2025, 17:00–17:15, H17

Ultrafast Dynamics of Vanadium Dioxide Phase Transformation — •Liuyue Yang, Daniel Sandner, and Hristo Igle — Laser and X-Ray Physics E11, TUM School of Natural Sciences, TUM, James-Franck-Str. 1 85748 Garching, Germany

Vanadium dioxide has been discovered to have a metal-to-insulator transformation (MIT) at 68 °C. To investigate the dynamics of MIT, we use the pump-probe experiment to obtain the reflective transient mid-infared spectrum of VO2. In the photoinduced VO2 MIT, the phase transformation can occur at high pump power. The reflectivity of VO2 increases significantly at the metal state. At high temperature, the phase transformation occurs at lower pump power. Moreover, we observed a reflectivity oscillation in wavelength around the zeropoint of pump delay. The oscillation frequency decreases rapidly with the delay time

Keywords: vanadium dioxide; pump-probe; phase transformation