Journal article · Preprint article
Electron–phonon coupling in single-layer MoS2
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.
Language: | English |
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Publisher: | Elsevier |
Year: | 2019 |
Pages: | 64-69 |
ISSN: | 18792758 and 00396028 |
Types: | Journal article and Preprint article |
DOI: | 10.1016/j.susc.2018.11.012 |
ORCIDs: | Hinsche, Nicki Frank , 0000-0002-5394-6911 , 0000-0002-0122-9443 , 0000-0001-7001-7930 , 0000-0002-5243-5888 and 0000-0001-5690-9668 |
Angle-resolved photoemission spectroscopy Density functional theory Electron-phonon coupling Transition metal dichalcogenides