Science

Ultrafast core-level spectroscopy reveals elusive precursors of exciton condensation in quantum materials

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 09/10/2026, 14:25:25 UTC.

Briefings

A 2026 study using ultrafast core-level spectroscopy observed microscopic fluctuations in quantum materials prior to the emergence of long-range order. The research identified precursors to exciton condensation, suggesting these phases form gradually rather than instantly at a transition temperature. Key findings include the detection of specific atomic-scale fluctuations and a timeline for when these precursors typically appear before macroscopic order.

Key points

• Ultrafast core-level spectroscopy was employed to observe microscopic fluctuations in quantum materials before long-range order develops.
• Fluctuations are identified as precursors to exciton condensation, appearing before the material crosses a transition temperature.

Context and limitations

The study covers only the specific phase transition observed in the quantum material sample; other materials and transition types are not included.

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