Fermi velocity renormalization in graphene probed by terahertz time-domain spectroscopy
- 20 March 2020
- journal article
- research article
- Published by IOP Publishing in 2D Materials
- Vol. 7 (3), 035009
- https://doi.org/10.1088/2053-1583/ab81b0
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 the electrical parameters (DC conductivity σDC, 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 (> 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 (σDC, 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.Keywords
Funding Information
- National Natural Science Foundation of China (51402291, 51702315)
- Chongqing Research Program of Basic Research: Frontier Technology (cstc2015jcyjA50018)
- Institute for Basic Science (IBS-R019-D1)
- Danmarks Grundforskningsfond (DNRF103)
- VINNOVA (2019-02878)
- Villum Fonden (00023215)
- EU Graphene Flagship Core 2 (785219)
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