Fermi velocity renormalization in graphene probed by terahertz time-domain spectroscopy

Patrick R. Whelan, Qian Shen, Binbin Zhou, I. G. Serrano, M. Venkata Kamalakar, David M.A. MacKenzie, Jie Ji, Deping Huang, Haofei Shi, Da Luo, Meihui Wang, Rodney S. Ruoff, Antti Pekka Jauho, Peter U. Jepsen, Peter Bøggild, José M. Caridad

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

We demonstrate terahertz time-domain spectroscopy (THz-TDS) to be an accurate, rapid and scalable method to probe the interaction-induced Fermi velocity renormalization ν∗F of charge carriers in graphene. This allows the quantitative extraction of all electrical parameters (DC conductivity σ DC, carrier density n, and carrier mobility µ) of large-scale graphene films placed on arbitrary substrates via THz-TDS. Particularly relevant are substrates with low relative permittivity (< 5) such as polymeric films, where notable renormalization effects are observed even at relatively large carrier densities (>1012 cm-2, Fermi level > 0.1 eV). From an application point of view, the ability to rapidly and non-destructively quantify and map the electrical (σ DC, n, µ) and electronic (ν∗F) properties of large-scale graphene on generic substrates is key to utilize this material in applications such as metrology, flexible electronics as well as to monitor graphene transfers using polymers as handling layers.

Original languageEnglish
Article number035009
Journal2D Materials
Volume7
Issue number3
DOIs
Publication statusPublished - Jul 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • fermi velocity renormalization. mobility mapping
  • flexible substrates
  • graphene
  • THz-TDS

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