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Journal of the Korean Physical Society

, Volume 76, Issue 1, pp 44–48 | Cite as

Renormalization of Dirac Cones by Correlation Effects in Heavily-Doped Graphene

  • Woo Jong Shin
  • Yeongsup Sohn
  • Sae Hee Ryu
  • Minjae Huh
  • Sung Won Jung
  • Keun Su KimEmail author
Article
  • 14 Downloads

Abstract

A longstanding question in the field of solid-state physics is the renormalization of quasiparticles induced by the effect of electronic correlations. We employ angle-resolved photoemission spectroscopy to study quasiparticle renormalizations in graphene whose electron density can be modulated by the deposition of alkali metals. The evolution of ARPES spectra taken over a wide range of the Rb density reveals a discontinuity in the electron compressibility, which is identified as due to the phase formation of Rb atoms on graphene. We found a clear satellite feature of Dirac cones formed by correlations effects, and its coupling strength is enhanced with the phase formation of Rb atoms. Our results suggest that in graphene doped by alkali metals the phase formation of dopants should be carefully considered in a quantitative analysis on band renormalizations.

Keywords

Graphene Electronic correlation ARPES 

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Notes

Acknowledgments

This work was supported from the National Research Foundation (NRF) of Korea (Grants No. 2017R1A2B3011368, No. 2017R1A5A1014862, and No. 2018K1A3A7A09027641), and the Future-leading Research Initiative of 2019-22-0079 of Yonsei University. PLS-II was supported in part by the Ministry of Science, ICT and Future Planning and Pohang University of Science and Technology.

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Copyright information

© The Korean Physical Society 2020

Authors and Affiliations

  • Woo Jong Shin
    • 1
    • 2
  • Yeongsup Sohn
    • 1
    • 2
  • Sae Hee Ryu
    • 1
    • 2
  • Minjae Huh
    • 1
    • 2
  • Sung Won Jung
    • 1
    • 2
  • Keun Su Kim
    • 1
    Email author
  1. 1.Department of PhysicsYonsei UniversitySeoulKorea
  2. 2.Department of PhysicsPohang University of Science and TechnologyPohangKorea

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