Visualizing the melting of periodic lattice distortions in a complex 2D charge density wave material via MeV-scale ultrafast electron diffraction

Khalid M. Siddiqui, Daniel B. Durham, Frederick Cropp, Sangeeta Rajpurohit, Colin Ophus, Yanglin Zhu, Johan D. Carlström, Camille Stavrakas, Zhiqiang Mao, Archana Raja, Pietro Musumeci, Liang Z. Tan, Andrew M. Minor, Robert A. Kaindl, Daniele Filippetto

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We discuss our experiments that apply ultrafast electron diffraction (UED) to study structural dynamics of the phase transition in single crystal tantalum ditelluride, TaTe2, a quasi-2D quantum material which exhibits a trimer superstructure at cryogenic temperatures. Intense near-infrared (NIR) pulses at 1030 nm are employed to quench the low temperature, atomically ordered state and the process is captured by ultrashort bunches of electrons as a function of pump-probe time delay. The diffraction signatures of the trimer superstructure recover on picosecond time scales. These measurements of TaTe2 underscore moreover the applicability of the HiRES UED beamline at Lawrence Berkeley National Laboratory (LBNL) to probe ultrafast structural dynamics of complex materials.

Original languageEnglish (US)
Title of host publicationUltrafast Phenomena and Nanophotonics XXV
EditorsMarkus Betz, Abdulhakem Y. Elezzabi
ISBN (Electronic)9781510642034
StatePublished - 2021
EventUltrafast Phenomena and Nanophotonics XXV 2021 - Virtual, Online, United States
Duration: Mar 6 2021Mar 11 2021

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceUltrafast Phenomena and Nanophotonics XXV 2021
Country/TerritoryUnited States
CityVirtual, Online


  • 2D materials
  • charge density waves
  • photoinduced phase transition
  • relativistic electron bunches
  • tantalum ditelluride
  • trimerization
  • ultrafast electron diffraction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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