Effect of external magnetic field on the instability of THz plasma waves in nanoscale graphene field-effect transistors

doi:10.1088/1674-1056/ad1e66

Abstract The instability of plasma waves in the channel of field-effect transistors will cause the electromagnetic waves with THz frequency. Based on a self-consistent quantum hydrodynamic model, the instability of THz plasmas waves in the channel of graphene field-effect transistors has been investigated with external magnetic field and quantum effects. We analyzed the influence of weak magnetic fields, quantum effects, device size, and temperature on the instability of plasma waves under asymmetric boundary conditions numerically. The results show that the magnetic fields, quantum effects, and the thickness of the dielectric layer between the gate and the channel can increase the radiation frequency. Additionally, we observed that increase in temperature leads to a decrease in both oscillation frequency and instability increment. The numerical results and accompanying images obtained from our simulations provide support for the above conclusions.

Keywords: graphene field-effect transistors external magnetic field radiation frequency instability increment

Received: 24 October 2023
Revised: 28 December 2023
Accepted manuscript online: 15 January 2024

PACS:	81.05.ue	(Graphene)
	52.20.-j	(Elementary processes in plasmas)
	52.35.-g	(Waves, oscillations, and instabilities in plasmas and intense beams)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 12065015) and the Hongliu Firstlevel Discipline Construction Project of Lanzhou University of Technology.

Corresponding Authors: Liping Zhang
E-mail: zhanglp@lut.edu.cn

Cite this article:

Liping Zhang(张丽萍), Zongyao Sun(孙宗耀), Jiani Li(李佳妮), and Junyan Su(苏俊燕) Effect of external magnetic field on the instability of THz plasma waves in nanoscale graphene field-effect transistors 2024 Chin. Phys. B 33 048102

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Effect of external magnetic field on the instability of THz plasma waves in nanoscale graphene field-effect transistors

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