Hypersound Absorption of Acoustic Phonons in a Degenerate Carbon Nanotube

Abstract

We present a theoretical study of acoustic phonons amplification in Carbon Nanotubes (CNT). The phenomenon is via Cerenkov emission (CE) of acoustic phonons using intraband transitions proposed by Mensah et. al., [1] in Semiconductor Superlattices (SSL) and confirmed in [2]. From this, an asymmetric graph of Γ CN T on V d Vs and Ωτ were obtained where amplification (Γ CN T amp ) >> absorption (Γ CN T abs ). The ratio, |Γ CN T amp | |Γ CN T abs | ≈ 3.5, at V d = 1.02V s , ω q = 3.0 THz and T = 85 K for scattering angle θ > 0 . A threshold field at which Γ CN T abs switches over to Γ CN Tamp was calculated to be E dc z = 6.2 × 10 3 V/m. This field is far less than that deduced using Bloch-Type Oscillation (BTO) [3] which is E dc BT O = 3.0 × 10 5 V/m. The obtained Γ CN T amp would enable the use of CNT for the production of SASER.

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Absorption of Acoustic Phonons in Fluorinated Carbon Nanotubes with Non-Parabolic, Double Periodic Band

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Acoustoelectric effect in graphene with degenerate energy dispersion

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