Fermi velocity renormalization in graphene probed by terahertz time-domain spectroscopy
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2020-07
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en
Pages
10
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2D Materials, Volume 7, issue 3
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.Description
| openaire: EC/H2020/785219/EU//GrapheneCore2
Keywords
fermi velocity renormalization. mobility mapping, flexible substrates, graphene, THz-TDS
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Citation
Whelan, P R, Shen, Q, Zhou, B, Serrano, I G, Kamalakar, M V, MacKenzie, D M A, Ji, J, Huang, D, Shi, H, Luo, D, Wang, M, Ruoff, R S, Jauho, A P, Jepsen, P U, Bøggild, P & Caridad, J M 2020, ' Fermi velocity renormalization in graphene probed by terahertz time-domain spectroscopy ', 2D Materials, vol. 7, no. 3, 035009 . https://doi.org/10.1088/2053-1583/ab81b0