Charge-density wave transitions of rare-earth tritellurides investigated by femtosecond electron crystallography

ORAL

Abstract

The electron-phonon mechanism that gives rise to various charge-ordered systems depends on the topology of the Fermi surface that is subjective to the influence of hybridization, nesting, and electron correlation at low dimensions. Rare-earth tritellurides are ideal systems to investigate the two-dimensional charge-density density wave (CDW) formation as both nesting and hybridization are at play to select the unidirectional CDW at different temperatures. Using fs electron crystallography, we investigate the noncooperative suppression of the structural order parameters following ultrafast electronic quenching and correlate electronic and ionic evolutions based on a framework of three-temperature model and nonisotropic fluctuational analysis. We show that a joint consideration of the couplings between the lattice phonons, the CDW collective modes, and the corresponding electronic subsystem is required to account for the various novel structural dynamics features.

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Authors

  • Tzong-Ru T. Han

    Physics and Astronomy Department, Michigan State University, East Lansing, Michigan 48824, USA, Physics and Astronomy Department, Michigan State University

  • Zhensheng Tao

    Physics and Astronomy Department, Michigan State University, East Lansing, Michigan 48824, USA

  • S. D. Mahanti

    Physics and Astronomy Department, Michigan State University, East Lansing, Michigan 48824, USA, Department of Physics, Michigan State University, Department of Physics and Astronomy, Michigan State University

  • Kiseok Chang

    Physics and Astronomy Department, Michigan State University, East Lansing, Michigan 48824, USA, Physics and Astronomy Department, Michigan State University

  • Chong-yu Ruan

    Physics and Astronomy Department, Michigan State University, East Lansing, Michigan 48824, USA, Physics and Astronomy Department, Michigan State University

  • Christos D. Malliakas

    Department of Chemistry, Northwestern University, Evaston, Illinois 60208, USA

  • M. Kanatzidis

    Department of Chemistry, Northwestern University, Evaston, Illinois 60208, USA, Northwestern University, Argonne National Laboratory and Northwestern University, Argonne National Laboratory; Northwestern University, ANL and Northwestern University