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Fermi velocity renormalization in graphene probed by terahertz time-domain spectroscopy
- Source :
- 2D Materials, 2020, 7, 3, 035009
- Publication Year :
- 2020
-
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 {\nu}F^* of charge carriers in graphene. This allows the quantitative extraction of all electrical parameters (DC conductivity {\sigma}DC, carrier density n, and carrier mobility {\mu}) 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 (> 10^12 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 ({\sigma}DC, n, {\mu}) and electronic ({\nu}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.<br />Comment: 23 pages, 8 figures
Details
- Database :
- arXiv
- Journal :
- 2D Materials, 2020, 7, 3, 035009
- Publication Type :
- Report
- Accession number :
- edsarx.2006.00486
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1088/2053-1583/ab81b0