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
2Department of Applied Physics, University for Development Studies, Navrongo, Ghana
4Department of Physics, The Pennsylvania State University, Altoona, USA
Received October 11, 2021, revised January 1, 2022, published online May 20, 2022
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.