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

doi:10.1117/12.2577621

5 March 2021 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

Author Affiliations +

Proceedings Volume 11684, Ultrafast Phenomena and Nanophotonics XXV; 116840A (2021) https://doi.org/10.1117/12.2577621
Event: SPIE OPTO, 2021, Online Only

Abstract

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.

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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, and Daniele Filippetto "Visualizing the melting of periodic lattice distortions in a complex 2D charge density wave material via MeV-scale ultrafast electron diffraction", Proc. SPIE 11684, Ultrafast Phenomena and Nanophotonics XXV, 116840A (5 March 2021); https://doi.org/10.1117/12.2577621

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