{"id":20982,"date":"2026-10-10T12:07:18","date_gmt":"2026-10-10T12:07:18","guid":{"rendered":"https:\/\/news.theck1.no\/?p=20982"},"modified":"2026-10-10T12:07:18","modified_gmt":"2026-10-10T12:07:18","slug":"ultrafast-core-level-spectroscopy-reveals-elusive-precursors-of-exciton-condensation-in-quantum-materials","status":"publish","type":"post","link":"https:\/\/news.theck1.no\/?p=20982","title":{"rendered":"Ultrafast core-level spectroscopy reveals elusive precursors of exciton condensation in quantum materials"},"content":{"rendered":"

AI-rewritten:<\/strong> This is a summary of an article from Phys.org, rewritten by AI (Qwen, running locally) to make it easier to read. The facts come from the original article – read it for the full story.<\/p>\n

Phys.org • October 9, 2026<\/strong><\/div>\n\n

Researchers used ultrafast core-level spectroscopy to study a quantum material called 1T-TiSe2, which undergoes a phase transition at approximately 200 Kelvin. Below this temperature, the material forms a charge-density wave where electronic density and atomic lattice become periodically modulated. For decades, scientists have debated whether excitons play a central role in creating this state. An exciton is formed when an electron moves from the valence band to the conduction band, binding with the positively charged hole it leaves behind through electrical attraction.<\/p>\n

<\/p>\n

The study employed ultrafast broadband extreme-ultraviolet absorption spectroscopy (UBXAS) to track how quickly these excitonic correlations responded to laser pulses. This technique allows scientists to probe specific electronic states, such as Se 4p and Ti 3d, with high sensitivity. The researchers found that excitonic interactions persist even above the transition temperature where long-range order has not yet developed. Furthermore, near the critical temperature, the material showed enhanced susceptibility, meaning it responded exceptionally fast to perturbation regardless of the laser intensity used.<\/p>\n

These findings suggest that microscopic fluctuations related to excitons exist before the material fully transitions into its ordered phase. The characteristic dependence of the response time on laser fluence observed far from the transition temperature disappeared near Tc, indicating a unique instability in the system. This work provides a new method to observe these elusive precursor fluctuations using element-resolved spectroscopy, offering fresh insight into how emergent phases arise in quantum materials.<\/p>\n

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Source:<\/strong> Phys.org • October 9, 2026<\/p>\n

Read the original article at Phys.org →<\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

AI-rewritten: This is a summary of an article from Phys.org, rewritten by AI (Qwen, running locally) to make it easier to read. The facts come from the original article – read it for the full story. Phys.org • October 9, 2026 Researchers used ultrafast core-level spectroscopy to study a quantum material called 1T-TiSe2, which undergoes<\/p>\n

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