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  2. Precursor region with full phonon softening above the charge-density-wave phase transition in 2H-TaSe$_2$
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    Datenpaket: Precursor region with full phonon softening above the charge-density-wave phase transition in 2H-TaSe$_2$

    Alternativer Identifier:
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    Verwandter Identifier:
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    Ersteller/in:
    Weber, Frank [Institut für Quantenmaterialien und -technologien]

    Shen, Xingchen [Institut für Quantenmaterialien und -technologien]

    Heid, Rolf [Institut für Quantenmaterialien und -technologien]

    Hott, Roland [Institut für Quantenmaterialien und -technologien]

    Haghighirad, Amir-Abbas [Institut für Quantenmaterialien und -technologien]

    Salzmann, Björn [Salzmann, Björn]

    Cantarino, Marli dos Reis [Cantarino, Marli dos Reis]

    Monney, Claude [Monney, Claude]

    Said, Ayman H. [Said, Ayman H.]

    Frachet, Mehdi [Institut für Quantenmaterialien und -technologien]

    Murphy, Bridget [Murphy, Bridget]

    Rossnagel, Kai [Rossnagel, Kai]

    Rosenkranz, Stephan [Rosenkranz, Stephan]
    Beitragende:
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    Titel:
    Precursor region with full phonon softening above the charge-density-wave phase transition in 2H-TaSe$_2$
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    Beschreibung:
    (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.
    (Technical Remarks) data are stored in an project of origin lab format
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    Herausgeber/in:
    Karlsruhe Institute of Technology
    Erstellungsjahr:
    Fachgebiet:
    Physics
    Objekttyp:
    Dataset
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    Erscheinungsjahr:
    Rechteinhaber/in:
    Weber, Frank

    Shen, Xingchen

    Heid, Rolf

    Hott, Roland

    Haghighirad, Amir-Abbas

    Salzmann, Björn

    Cantarino, Marli dos Reis

    Monney, Claude

    Said, Ayman H.

    Frachet, Mehdi

    Murphy, Bridget

    Rossnagel, Kai

    Rosenkranz, Stephan
    Förderung:
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    Status:
    Publiziert
    Eingestellt von:
    kitopen
    Erstellt am:
    Archivierungsdatum:
    2023-10-24
    Archivgröße:
    381,4 kB
    Archiversteller:
    kitopen
    Archiv-Prüfsumme:
    369c949e21278e8d14fea2fe8feefce1 (MD5)
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