Domain Suppression in the Negative Differential Conductivity Region of Carbon Nanotubes by Applied AC Electric Field

Abstract

We study theoretically the electron transport properties in achiral carbon nanotubes under the influence of an external electric field <i>E(t)</i> using Boltzmann’s transport equation to derive the current-density. A negative differential conductivity (NDC) is predicted in quasi-static approximation <i>i.e.</i>, <i>ωτ</i> << 1, similar to that observed in superlattice. However, a strong enhancement in the current density intensity is observed in NDC of the achiral carbon nanotubes. This is observed at where the constant electric field E<sub>0</sub> is equal to the amplitude of the AC electric field E<sub>1</sub>. 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

Influence of external temperature gradient on acoustoelectric current in graphene

“…Here, Negative Differential Conductivity (NDC) in FSG is reported. This is analogous to the electronic NDC [33,34] which is a useful ingredient for developing graphene based thermal systems such as signal manipulation devices, thermal logic gates and thermal amplifiers [31].…”

Stark-cyclotron Resonance in an Array of Carbon Nanotubes

“…The indices (n, m) determine the diameter and the chiral angle of the CN s. As n and m vary, the conduction ranges from metallic to semiconducting [11], with an inverse diameter dependent band gap of ≤ 1eV [11]. Electron transport properties in CNs have been the subject of intense research [10,11,12,13,14,15,16,17,18]. More recently, electronic transport in an array of CNs is the subject of many theoretical papers [19,20,21,22,23,24,25,26,27,28].…”

High-Frequency Electric Field Induced Nonlinear Electron Transport in Chiral Carbon Nanotubes

“…The unique architectural, structural and physicochemical properties have made CNT a promising candidate for application in new generation of nanoelectronics [18]- [21], sensors [22] [23], electrochemical capacitors [24]- [26], Li-ion batteries [27]- [29] and terahertz (THz) generation and amplification [30]- [34], just to mention a few. Furthermore, negative differential conductivity properties of CNTs have been reported [6] [35] [36], while phenomena like rectification of electromagnetic waves, domain suppression in negative differential conductivity region, high-frequency (hf) conductivity, high order harmonic generation and many others have also been considered [37]- [40].…”