Precursor region with full phonon softening above the charge-density-wave phase transition in 2H-TaSe2

Xingchen Shen, Rolf Heid, Roland Hott, Amir-Abbas Haghighirad, Björn Salzmann, Marli Reis Cantarino, Claude Monney, Ayman H. Said, Mehdi Frachet, Bridget Murphy, Kai Rossnagel, Stephan Rosenkranz and Frank Weber ()
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Xingchen Shen: Karlsruhe Institute of Technology
Rolf Heid: Karlsruhe Institute of Technology
Roland Hott: Karlsruhe Institute of Technology
Amir-Abbas Haghighirad: Karlsruhe Institute of Technology
Björn Salzmann: Université de Fribourg
Marli Reis Cantarino: Université de Fribourg
Claude Monney: Université de Fribourg
Ayman H. Said: Argonne National Laboratory
Mehdi Frachet: Karlsruhe Institute of Technology
Bridget Murphy: Kiel University
Kai Rossnagel: Kiel University
Stephan Rosenkranz: Argonne National Laboratory
Frank Weber: Karlsruhe Institute of Technology

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Research on charge-density-wave (CDW) ordered transition-metal dichalcogenides continues to unravel new states of quantum matter correlated to the intertwined lattice and electronic degrees of freedom. Here, we report an inelastic x-ray scattering investigation of the lattice dynamics of the canonical CDW compound 2H-TaSe2 complemented by angle-resolved photoemission spectroscopy and density functional perturbation theory. Our results rule out the formation of a central-peak without full phonon softening for the CDW transition in 2H-TaSe2 and provide evidence for a novel precursor region above the CDW transition temperature TCDW, which is characterized by an overdamped phonon mode and not detectable in our photoemission experiments. Thus, 2H-TaSe2 exhibits structural before electronic static order and emphasizes the important lattice contribution to CDW transitions. Our ab-initio calculations explain the interplay of electron-phonon coupling and Fermi surface topology triggering the CDW phase transition and predict that the CDW soft phonon mode promotes emergent superconductivity near the pressure-driven CDW quantum critical point.

Date: 2023
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DOI: 10.1038/s41467-023-43094-5

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