English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We present a theoretical study of acoustic phonons amplification in CarbonNanotubes (CNT). The phenomenon is via Cerenkov emission (CE) of acousticphonons using intraband transitions proposed by Mensah et. al.,~\cite{1} inSemiconductor Superlattices (SSL) and confirmed in ~\cite{2}. From this, anasymmetric graph of $\Gamma^{CNT}$ on $\frac{V_d}{V_s}$ and $\Omega\tau$ wereobtained where amplification ($\Gamma_{amp}^{CNT}$) $>>$ absorption($\Gamma_{abs}^{CNT}$). The ratio, $\frac{\vert\Gamma_{amp}^{CNT}\vert}{\vert\Gamma_{abs}^{CNT}\vert}\approx 3.5$, at $V_d =1.02V_s$, $\omega_q = 3.0\ \mathrm{THz}$ and $T = 85\ K$ for scattering angle$\theta > 0$ . A threshold field at which $\Gamma_{abs}^{CNT}$ switches over to$\Gamma_{amp}^{CNT}$ was calculated to be $E_{z}^{dc} = 6.2\times 10^3\\mathrm{V/m}$. This field is far less than that deduced using Bloch-TypeOscillation (BTO)~\cite{3} which is $E_{BTO}^{dc} = 3.0\times 10^5\\mathrm{V/m}$. The obtained $\Gamma_{amp}^{CNT}$ would enable the use of CNTfor the production of SASER.

On the amplification of acoustic phonons in carbon nanotube