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Da, LUO
다차원 탄소재료 연구단
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Fermi velocity renormalization in graphene probed by terahertz time-domain spectroscopy

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Title
Fermi velocity renormalization in graphene probed by terahertz time-domain spectroscopy
Author(s)
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
Subject
fermi velocity renormalization. mobility mapping, ; flexible substrates, ; graphene, ; THz-TDS
Publication Date
2020-07
Journal
2D MATERIALS, v.7, no.3, pp.035009
Publisher
IOP PUBLISHING LTD
Abstract
© 2020 IOP Publishing Ltd. 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
URI
https://pr.ibs.re.kr/handle/8788114/7788
DOI
10.1088/2053-1583/ab81b0
ISSN
2053-1583
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > 1. Journal Papers (저널논문)
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