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This study utilizes ultrafast XUV spectroscopy to resolve a five-decade-old debate regarding the electron-hole pairing mechanisms in the quantum material 1T-TiSe2. By capturing real-time dynamics on femtosecond timescales, researchers have successfully isolated excitonic disruption even at temperatures above the material's phase transition, offering a robust methodological framework for investigating complex quantum systems.
Method Tracks Quantum Material Shifts

Berkeley scientists used few-femtosecond XUV spectroscopy to observe how 1T-TiSe2, a quantum material, transforms in real time, revealing electron-hole pairing drives its shift.
Scientists used few-femtosecond XUV spectroscopy to track a quantum material’s atoms and electrons in the femtoseconds (10-15 seconds) just before it transforms. The research addresses a 50-year-old debate surrounding the material 1T-TiSe2 and its unusual behavior at approximately 200 Kelvin. Sheng-Chih Lin, a co-lead author of the…
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