Unveiling the plasma wave in the channel of graphene field-effect transistor

Soltani, A.; Kuschewski, F.; Bonmann, M.; Generalov, A.; Vorobiev, A.; Ludwig, F.; Wiecha, M.; Cibiraite, D.; Walla, F.; Kehr, S. C.; Eng, L. M.; Stake, J.; Roskos, H. G.

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Unveiling the plasma wave in the channel of graphene field-effect transistor

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Title:	Unveiling the plasma wave in the channel of graphene field-effect transistor
Author(s):	Soltani, A. ; Kuschewski, F. ; Bonmann, M. ; Generalov, A. ; Vorobiev, A. ; Ludwig, F. ; Wiecha, M. ; Cibiraite, D. ; Walla, F. ; Kehr, S. C. ; Eng, L. M. ; Stake, J. ; Roskos, H. G.
Date:	2019-09-01
Language:	en
Department:	Goethe University Frankfurt Technische Universität Dresden Chalmers University of Technology Department of Electronics and Nanoengineering
ISBN:	9781538682852
Series:	IRMMW-THz 2019 - 44th International Conference on Infrared, Millimeter, and Terahertz Waves, International Conference on Infrared, Millimeter, and Terahertz Waves
ISSN:	2162-2027 2162-2035
DOI-number:	10.1109/IRMMW-THz.2019.8873874
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Citation: Soltani , A , Kuschewski , F , Bonmann , M , Generalov , A , Vorobiev , A , Ludwig , F , Wiecha , M , Cibiraite , D , Walla , F , Kehr , S C , Eng , L M , Stake , J & Roskos , H G 2019 , Unveiling the plasma wave in the channel of graphene field-effect transistor . in IRMMW-THz 2019 - 44th International Conference on Infrared, Millimeter, and Terahertz Waves . , 8873874 , International Conference on Infrared, Millimeter, and Terahertz Waves , IEEE , International Conference on Infrared, Millimeter, and Terahertz Waves , Paris , France , 01/09/2019 . https://doi.org/10.1109/IRMMW-THz.2019.8873874
Abstract: Coupling an electromagnetic wave at GHz to THz frequencies into the channel of a graphene field-effect transistor (GFET) provokes collective charge carrier oscillations of the two-dimensional electron gas (2DEG) known as plasma waves. Here, we report the very first experimental and direct mapping of the electric field distribution in a gated GFET at nanometer length scales using scattering-type scanning near-field microscopy (s-SNOM) at 2 THz. Based on the experimental results we deduce the plasma wave velocity for different gate bias voltages, which is in good agreement with the theoretical prediction.

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