Investigation of the non-equilibrium state of strongly correlated materials by complementary ultrafast spectroscopy techniques

Hamoon Hedayat, Charles Sayers, Arianna Ceraso, Jasper van Wezel, Stephen Clark, Claudia Dallera, Giulio Cerullo, Enrico Da Como, Ettore Carpene

Research output: Contribution to journalArticlepeer-review

4 Citations (SciVal)


Photoinduced non-thermal phase transitions are new paradigms of exotic non-equilibrium physics of strongly correlated materials. An ultrashort optical pulse can drive the system to a new order through complex microscopic interactions that do not occur in the equilibrium state. Ultrafast spectroscopies are unique tools to reveal the underlying mechanisms of such transitions which lead to transient phases of matter. Yet, their individual specificities often do not provide an exhaustive picture of the physical problem. One effective solution to enhance their performance is the integration of different ultrafast techniques. This provides an opportunity to simultaneously probe physical phenomena from different perspectives while maintaining the same experimental conditions. In this context, we performed complementary experiments by combining time-resolved reflectivity and time and angle-resolved photoemission spectroscopy. We demonstrate the advantage of this combined approach by investigating the complex charge density wave (CDW) phase in 1T-TiSe 2. Specifically, we show the key role of lattice degrees of freedom to establish and stabilize the CDW in this material.

Original languageEnglish
Article number033025
JournalNew Journal of Physics
Issue number3
Early online date2 Feb 2021
Publication statusPublished - 15 Mar 2021


  • 1T-TiSe
  • Angle-resolved photoemission spectroscopy
  • Charge density wave
  • Phase transitions
  • Time-resolved technique
  • Ultrafast optical spectroscopy

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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