Holstein polaron in a valley-degenerate two-dimensional semiconductor

Mingu Kang, Sung Won Jung, Woo Jong Shin, Yeongsup Sohn, Sae Hee Ryu, Timur K. Kim, Moritz Hoesch, Keun Su Kim

Research output: Contribution to journalLetter

17 Citations (Scopus)

Abstract

Two-dimensional (2D) crystals have emerged as a class of materials with tunable carrier density1. Carrier doping to 2D semiconductors can be used to modulate many-body interactions2 and to explore novel composite particles. The Holstein polaron is a small composite particle of an electron that carries a cloud of self-induced lattice deformation (or phonons)3–5, which has been proposed to play a key role in high-temperature superconductivity6 and carrier mobility in devices7. Here we report the discovery of Holstein polarons in a surface-doped layered semiconductor, MoS2, in which a puzzling 2D superconducting dome with the critical temperature of 12 K was found recently8–11. Using a high-resolution band mapping of charge carriers, we found strong band renormalizations collectively identified as a hitherto unobserved spectral function of Holstein polarons12–18. The short-range nature of electron–phonon (e–ph) coupling in MoS2 can be explained by its valley degeneracy, which enables strong intervalley coupling mediated by acoustic phonons. The coupling strength is found to increase gradually along the superconducting dome up to the intermediate regime, which suggests a bipolaronic pairing in the 2D superconductivity.

Original languageEnglish
Pages (from-to)676-680
Number of pages5
JournalNature materials
Volume17
Issue number8
DOIs
Publication statusPublished - 2018 Aug 1

Fingerprint

Gene Conversion
Domes
Phonons
valleys
Semiconductor materials
domes
Polarons
Carrier mobility
Composite materials
phonons
Superconductivity
Charge carriers
composite materials
Acoustics
Doping (additives)
polarons
carrier mobility
Temperature
Crystals
Electrons

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Kang, M., Jung, S. W., Shin, W. J., Sohn, Y., Ryu, S. H., Kim, T. K., ... Kim, K. S. (2018). Holstein polaron in a valley-degenerate two-dimensional semiconductor. Nature materials, 17(8), 676-680. https://doi.org/10.1038/s41563-018-0092-7
Kang, Mingu ; Jung, Sung Won ; Shin, Woo Jong ; Sohn, Yeongsup ; Ryu, Sae Hee ; Kim, Timur K. ; Hoesch, Moritz ; Kim, Keun Su. / Holstein polaron in a valley-degenerate two-dimensional semiconductor. In: Nature materials. 2018 ; Vol. 17, No. 8. pp. 676-680.
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Kang, M, Jung, SW, Shin, WJ, Sohn, Y, Ryu, SH, Kim, TK, Hoesch, M & Kim, KS 2018, 'Holstein polaron in a valley-degenerate two-dimensional semiconductor', Nature materials, vol. 17, no. 8, pp. 676-680. https://doi.org/10.1038/s41563-018-0092-7

Holstein polaron in a valley-degenerate two-dimensional semiconductor. / Kang, Mingu; Jung, Sung Won; Shin, Woo Jong; Sohn, Yeongsup; Ryu, Sae Hee; Kim, Timur K.; Hoesch, Moritz; Kim, Keun Su.

In: Nature materials, Vol. 17, No. 8, 01.08.2018, p. 676-680.

Research output: Contribution to journalLetter

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Kang M, Jung SW, Shin WJ, Sohn Y, Ryu SH, Kim TK et al. Holstein polaron in a valley-degenerate two-dimensional semiconductor. Nature materials. 2018 Aug 1;17(8):676-680. https://doi.org/10.1038/s41563-018-0092-7