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.
@article{arxiv.1811.07297,
title = {Electron-phonon coupling in single-layer MoS2},
author = {Sanjoy K. Mahatha and Arlette S. Ngankeu and Nicki Frank Hinsche and Ingrid Mertig and Kevin Guilloy and Peter L. Matzen and Marco Bianchi and Charlotte E. Sanders and Jill A. Miwa and Harsh Bana and Elisabetta Travaglia and Paolo Lacovig and Luca Bignardi and Daniel Lizzit and Rosanna Larciprete and Alessandro Baraldi and Silvano Lizzit and Philip Hofmann},
journal= {arXiv preprint arXiv:1811.07297},
year = {2018}
}