Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Amplification of Acoustic Waves in Graphene Nanoribbon in the Presence
  of External Electric and Magnetic Field   Amplification of Acoustic Waves in Armchair Graphene Nanoribbon (AGNR) in the
presence of an external Electric and Magnetic field was studied using the
Boltzmann's kinetic equation. The general expression for the Amplification
$(\Gamma_{\perp}/\Gamma_0)$ was obtained in the region $ql >> 1$ for the energy
dispersion $\varepsilon(\vec{p})$ near the Fermi point. For various parameters
of the quantized wave vector ($\beta$), the analysis of
$\Gamma_{\perp}/\Gamma_0$ against the sub-bands index $(p_i)$; width of AGNR;
and magnetic strength $(\Omega\tau)$, were numerically analyzed. The results
showed a linear relation for $\Gamma_{\perp}/\Gamma_0$ with constant electric
field $(\vec{E})$ but non-linear for $\Gamma_{\perp}/\Gamma_0$ with $q$ or
$\Omega\tau$. Sound Amplification in AGNR is reported with an increase in
Acoustic wave number $(\vec{q}) > 1.5\times 10^{7}cm^{-1}$. This can cause
SASER in Armchair Graphene Nanoribbon (AGNR).

26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
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The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
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The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol