Abstract
We study theoretically the electron transport properties in achiral carbon nanotubes under the influence of an external electric field E(t) using Boltzmann’s transport equation to derive the current-density. A negative differential conductivity (NDC) is predicted in quasi-static approximation i.e., ωτ 0 is equal to the amplitude of the AC electric field E1. The peak of the NDC intensity occurs at very weaker fields than that of superlattice under the same conditions. The peak intensity decreases and shifts to right with the increase in the amplitude of the ac field. This mechanism suppresses the domain formation and therefore could be used in terahertz frequency generation.
Highlights
Carbon nanotubes (CNTs) were first discovered by Iijima in 1991 [1], and since there has been exponential growth in the interest of the quasi-one-dimensional monomolecular structure due to their unique and outstanding electrical, mechanical, and chemical properties
Mensah [3] studied the negative differential conductivity (NDC) effect in a semiconductor SL in the presence of an external electric field and showed that the NDC occurred in the current density characteristics when 1 i.e. near where the constant electric field is equal to the amplitude of the ac electric field and the peak decreases with increasing the amplitude of the ac field
Earity associated with the non-parabolicity of the electron energy band) which is very strong in SWCNT because of the high stark component
Summary
Carbon nanotubes (CNTs) were first discovered by Iijima in 1991 [1], and since there has been exponential growth in the interest of the quasi-one-dimensional monomolecular structure due to their unique and outstanding electrical, mechanical, and chemical properties. The NDC is believed to provide current instability in CNTs [2] which is destructive for the formation of terahertz (THz) radiation as in semiconducting superlattices (SLs). Simultaneous application of both dc-and ac-fields to the CNTs will result in nonlinear phase of the instability [2] as observed in semiconducting superlattices (SL). We report a systematic theoretical investigation of effect of simultaneous application of dc and ac field to armchair CNT (a-SWCNT) and zigzag CNT (z-SWCNT) using the Boltzmann’s transport equation to derive the current density and analyze the behavior of the normalized current density as a function of dc electric field
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
