Electron–phonon coupling in single-layer MoS2

Research output: Contribution to journalJournal article – Annual report year: 2019Researchpeer-review

  • Author: Mahatha, Sanjoy K.

    Aarhus University

  • Author: Ngankeu, Arlette S.

    Aarhus University

  • Author: Hinsche, Nicki Frank

    Department of Physics, Technical University of Denmark, Denmark

  • Author: Mertig, Ingrid

    Martin Luther University Halle-Wittenberg

  • Author: Guilloy, Kevin

    Aarhus University

  • Author: Matzen, Peter L.

    Aarhus University

  • Author: Bianchi, Marco

    Aarhus University

  • Author: Sanders, Charlotte E.

    Rutherford Appleton Laboratory

  • Author: Miwa, Jill A.

    Aarhus University

  • Author: Bana, Harsh

    University of Trieste

  • Author: Travaglia, Elisabetta

    University of Trieste

  • Author: Lacovig, Paolo

    Sincrotrone Trieste

  • Author: Bignardi, Luca

    Sincrotrone Trieste

  • Author: Lizzit, Daniel

    Sincrotrone Trieste

  • Author: Larciprete, Rosanna

    CNR

  • Author: Baraldi, Alessandro

    University of Trieste

  • Author: Lizzit, Silvano

    Sincrotrone Trieste

  • Author: Hofmann, Philip

    Aarhus University

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The electron–phonon coupling strength in the spin–split valence band maximum of single-layer MoS2 is studied using angle-resolved photoemission spectroscopy and density functional theory-based calculations. Values of the electron–phonon coupling parameter λ are obtained by measuring the linewidth of the spin–split bands as a function of temperature and fitting the data points using a Debye model. The experimental values of λ for the upper and lower spin–split bands at K are found to be 0.05 and 0.32, respectively, in excellent agreement with the calculated values for a free-standing single-layer MoS2. The results are discussed in the context of spin and phase-space restricted scattering channels, as reported earlier for single-layer WS2 on Au(111). The fact that the absolute valence band maximum in single-layer MoS2 at K is almost degenerate with the local valence band maximum at Γ can potentially be used to tune the strength of the electron–phonon interaction in this material.

Original languageEnglish
JournalSurface Science
Volume681
Pages (from-to)64-69
Number of pages6
ISSN0039-6028
DOIs
Publication statusPublished - 2019
CitationsWeb of Science® Times Cited: No match on DOI

    Research areas

  • Angle-resolved photoemission spectroscopy, Density functional theory, Electron-phonon coupling, Transition metal dichalcogenides
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