Charge dynamics and electronic structures of monolayer graphene with molecular doping

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

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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.

Original languageEnglish
Article number111907
JournalApplied Physics Letters
Issue number11
Publication statusPublished - 2012 Sep 10


ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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