Core-level signature of long-range density-wave order and short-range excitonic correlations probed by attosecond broadband spectroscopy
Researchers used attosecond broadband XUV absorption spectroscopy to find core-level signatures of long-range charge-density-wave order and short-range excitonic correlations in 1T-TiSe2. Static measurements failed to show a phase transition signal, but time-resolved studies revealed transient features indicating that short-range excitonic fluctuations precede the formation of the material's long-range density wave order.