Fizika Nizkikh Temperatur: Volume 48, Number 7 (July 2022), p. 621-624    ( to contents , go back )

Enhanced nonlinear conductivity due to hot-electron injection in carbon nanotubes

S. S. Abukari1, S. Y. Mensah1, R. Musah2, M. Amekpewu 2, N. G. Mensah3, and K. W. Adu4,5

1Department of Physics, Laser and Fibre Optics Centre, University of Cape Coast, Cape Coast, Ghana
E-mail: sabukari@uds.edu.gh

2Department of Applied Physics, University for Development Studies, Navrongo, Ghana
3Department of Mathematics, University of Cape Coast, Cape Coast, Ghana

4Department of Physics, The Pennsylvania State University, Altoona, USA
5Materials Research Institute, The Pennsylvania State University, University Park, USA
pos Анотація:621

Received October 11, 2021, revised January 1, 2022, published online May 20, 2022

Abstract

We have theoretically obtained an expression for the current density in a terahertz field due to hot-electron injection in carbon nanotubes. The injection modifies the stationary distribution function and leads to a qualitative change in the behavior of the current-voltage characteristics and causes absolute negative conductivity. We compared the current-voltage characteristic behavior at different injection rates and observed a drastic change in the current density and absolute negative conductivity values. We propose that carbon nanotubes with hot-electron injection may be useful for high-frequency applications.

Key words: terahertz field, mathematical model, hot-electron injection, carbon nanotubes.

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