Charge dynamics and electronic structures of monolayer graphene with molecular doping

C. C. Shen; C. T. Lin; L. J. Li; H. L. Liu

doi:10.1063/1.4752131

Charge dynamics and electronic structures of monolayer graphene with molecular doping

C. C. Shen, C. T. Lin, L. J. Li, H. L. Liu^*

^*此作品的通信作者

物理學系

研究成果: 雜誌貢獻 › 期刊論文 › 同行評審

9 引文斯高帕斯（Scopus）

摘要

THz absorption and spectroscopic ellipsometry were used to investigate the charge dynamics and electronic structures of monolayer graphene with doping by triazine. The absorption spectrum of the triazine-doped film shows an optical excitation near 5.1 eV that is blue shifted compared with that of undoped analog. THz conductivity displays a coherent response of itinerant charge carriers at zero frequency and a disorder-induced finite frequency peak around 155 cm ^-1. Drude plasma frequency (∼4400 cm ^-1) decreases with decreasing temperature while carrier relaxation time (∼13 fs) is almost temperature independent, implying the semiconducting behavior with thermal activation energy of 3 meV.

原文	英語
文章編號	111907
期刊	Applied Physics Letters
卷	101
發行號	11
DOIs	https://doi.org/10.1063/1.4752131
出版狀態	已發佈 - 2012 9月 10

ASJC Scopus subject areas

物理與天文學（雜項）

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title = "Charge dynamics and electronic structures of monolayer graphene with molecular doping",

abstract = "THz absorption and spectroscopic ellipsometry were used to investigate the charge dynamics and electronic structures of monolayer graphene with doping by triazine. The absorption spectrum of the triazine-doped film shows an optical excitation near 5.1 eV that is blue shifted compared with that of undoped analog. THz conductivity displays a coherent response of itinerant charge carriers at zero frequency and a disorder-induced finite frequency peak around 155 cm -1. Drude plasma frequency (∼4400 cm -1) decreases with decreasing temperature while carrier relaxation time (∼13 fs) is almost temperature independent, implying the semiconducting behavior with thermal activation energy of 3 meV.",

author = "Shen, {C. C.} and Lin, {C. T.} and Li, {L. J.} and Liu, {H. L.}",

note = "Funding Information: We acknowledge financial support from the National Science Council of Republic of China under Grant No. NSC98-2112-M-003-004-MY3. ",

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AU - Shen, C. C.

AU - Lin, C. T.

AU - Li, L. J.

AU - Liu, H. L.

N1 - Funding Information: We acknowledge financial support from the National Science Council of Republic of China under Grant No. NSC98-2112-M-003-004-MY3.

PY - 2012/9/10

Y1 - 2012/9/10

N2 - THz absorption and spectroscopic ellipsometry were used to investigate the charge dynamics and electronic structures of monolayer graphene with doping by triazine. The absorption spectrum of the triazine-doped film shows an optical excitation near 5.1 eV that is blue shifted compared with that of undoped analog. THz conductivity displays a coherent response of itinerant charge carriers at zero frequency and a disorder-induced finite frequency peak around 155 cm -1. Drude plasma frequency (∼4400 cm -1) decreases with decreasing temperature while carrier relaxation time (∼13 fs) is almost temperature independent, implying the semiconducting behavior with thermal activation energy of 3 meV.

AB - THz absorption and spectroscopic ellipsometry were used to investigate the charge dynamics and electronic structures of monolayer graphene with doping by triazine. The absorption spectrum of the triazine-doped film shows an optical excitation near 5.1 eV that is blue shifted compared with that of undoped analog. THz conductivity displays a coherent response of itinerant charge carriers at zero frequency and a disorder-induced finite frequency peak around 155 cm -1. Drude plasma frequency (∼4400 cm -1) decreases with decreasing temperature while carrier relaxation time (∼13 fs) is almost temperature independent, implying the semiconducting behavior with thermal activation energy of 3 meV.

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Charge dynamics and electronic structures of monolayer graphene with molecular doping

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