Ultrafast Electronic Dynamics and Laser-Induced Incoherence in 1T”-TaTe<sub>2</sub>

ORAL

Abstract

The interplay between lattice distortion and electronic correlations in transition-metal dichalcogenides (TMDs) gives rise to diverse charge-ordered ground states and ultrafast collective dynamics. We present time-resolved angle-resolved photoemission spectroscopy (tr-ARPES) measurements on the low-temperature 3×3 phase of 1T″-TaTe₂ using a 1.55 eV pump and 21.3 eV high-harmonic probe. The melting of the gaps which arise due to low temperature phase transition and its dynamics are studied as a function of laser fluence, pointing to the different role of the lattice and electronic degrees of freedom. The implication of these results for establishing the nature of the quasi-1D charge order is discussed. 

*This work was primarily funded by the U.S. department of energy (DOE), Office of Science, Office of Basic energy Sciences, Materials Sciences and engineering division under contract no. de-Ac02-05cH11231 (Ultrafast Materials Science program Kc2203).

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Presenters

  • Cheng Hsun Wu

    • University of California, Berkeley

Authors

  • Cheng Hsun Wu

    • University of California, Berkeley

  • Yi Lin

    • University of Alabama

  • Maximilian Huber

    • Lawrence Berkeley National Laboratory

  • Alessandra Lanzara

    • University of California, Berkeley