Evidence of a coupled electron-phonon liquid in NbGe<sub>2</sub>

ORAL

Abstract

Hydrodynamic electron flow can be realized when the momentum-conserving scatterings of electrons in a material are more frequent than the momentum-relaxing ones. In principle, momentum-conserving electron-phonon scatterings can be enhanced in a coupled electron-phonon liquid to fulfill the above condition, but the candidates remain rare. Here, we present NbGe2 as a new candidate of such a liquid with strong electron-phonon interactions, phonon-drag behavior, and pronounced phonon-electron couplings as evidenced by experiments of quantum oscillations, electrical and thermal transport, and Raman scattering. Possible design principles of a coupled electron-phonon liquid will be discussed.

*NSF/DMR-1708929

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Publication: H.-Y. Yang et. al., Nat. Commun. 12, 5292 (2021).

Presenters

  • Hung-Yu Yang

    • Boston College

Authors

  • Hung-Yu Yang

    • Boston College

  • Xiaohan Yao

    • Boston College

  • Vincent M Plisson

    • Boston College

  • Shirin Mozaffari

    • University of Tennessee

  • Jan P Scheifers

    • University of Texas at Dallas

  • Aikaterini Flessa Savvidou

    • Florida State University

  • Eun Sang Choi

    • National High Magnetic Field Laboratory
    • National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
    • National High Magnetic Field Laboratory and Department of Physics, Florida State University

  • Gregory T McCandless

    • University of Texas at Dallas
    • University of Texas - Dallas
    • Department of Chemistry and Biochemistry, The University of Texas at Dallas

  • Mathieu F Padlewski

    • École Polytechnique Fédérale de Lausanne

  • Carsten Putzke

    • Ecole Polytechnique Federale de Lausanne
    • Laboratory of Quantum Materials (QMAT), Institute of Materials (IMX), Ecole Polytechnique Federale de Lausanne (EPFL)

  • Philip J Moll

    • Ecole Polytechnique Federale de Lausanne
    • Laboratory of Quantum Materials (QMAT), Institute of Materials (IMX), Ecole Polytechnique Federale de Lausanne

  • Julia Y Chan

    • University of Texas at Dallas
    • Department of Chemistry and Biochemistry, The University of Texas at Dallas

  • Luis Balicas

    • National High Magnetic Field Laboratory

  • Ken S Burch

    • Boston College

  • Fazel Tafti

    • Boston College