“Currentless” Amplification of Hypersound in a Planar Configuration by Inelastic Scattering of Electrons

Shmelev, G. M.; Anh, Ng Uyen Quoc; Tsurkan, G. I.; Mensah, S. Y.

doi:10.1002/pssb.2221210257

Cited by 3 publications

(3 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The AE was predicted by Grinberg and Kramer [10] for bipolar semiconductors and experimentally observed in Bismuth by Yamada [11]. By applying the sound flux ( W ), electric current ( j), and magnetic fields ( H) perpendicularly to the sample, it is interesting to note that, with the sample opened in direction perpendicular to the Hall direction, can leads to a non-zero Acoustomagnetoelectric Effect AME [12]. Mensah et.…”

Section: Introductionmentioning

confidence: 88%

Acoustomagnetoelectric Effect in Graphene Nanoribbon in the Presence of External Electric and Magnetic Fields

Dompreh¹,

Mensah²,

Abukari³

et al. 2015

Mathematics of Quantum Technologies

View full text Add to dashboard Cite

Acoustomagnetoelectric Effect (AME) in Graphene Nanoribbon (GNR) in the presence of an external electric and magnetic fields was studied using the Boltzmann kinetic equation. On open circuit, the Surface Acoustomagnetoelectric field ( E SAM E ) in GNR was obtained in the region ql >> 1, for energy dispersion ε(p) near the Fermi level. The dependence of E SAM E on the magnetic field strength (η), the sub-band index (p i ), and the width (N ) of GNR were analysed numerically. For E SAM E versus η, a non-linear graph was obtained. From the graph, at low magnetic field strength (η < 0.62), the obtained graph qualitatively agreed with that experimentally observed in graphite. However, at high magnetic field strength (η > 0.62), the E SAM E falls rapidly to a minimum value. We observed that in GNR, the maximum E SAM E was obtained at magnetic field H = 3.2Am −1 . The graphs obtained were modulated by varying the sub-band index p i with an inversion observed

show abstract

Section: Introductionmentioning

confidence: 88%

Acoustomagnetoelectric Effect in Graphene Nanoribbon in the Presence of External Electric and Magnetic Fields

Dompreh¹,

Mensah²,

Abukari³

et al. 2015

Mathematics of Quantum Technologies

View full text Add to dashboard Cite

show abstract

“…To calculate for the amplification of acoustic waves in AGNR, we shall proceed from the method developed in [46], where the sound flux ( W ), d.c. electric field ( j) and a constant magnetic field ( H) are considered mutually perpendicular to the plane of the AGNR. The acoustic wave is considered in the hypersound regime ql >> 1 (q is the acoustic wavenumber and l is the mean free path of an electron).…”

Section: Theorymentioning

confidence: 99%

Amplification of acoustic waves in armchair graphene nanoribbon in the presence of external electric and magnetic fields

Dompreh¹,

Mensah²,

Abukari³

et al. 2016

Physica E: Low-dimensional Systems and Nanostructures

View full text Add to dashboard Cite

“…Another important investigation in the linear regime is interaction of acoustic phonons with drift charges in CNT. It is well known that when acoustic phonons interact with charge carriers, it is accompanied by energy and momentum exchange which give rise to the following effects: Absorption (Amplification) of acoustic phonons [18,19]; Acoustoelectric Effect (AE) [20,21,22,23,24,25]; Acoustomagnetoelectric Effect (AME) [26,27,28,29,30]; Acoustothermal Effect [31] and Acoustomagnetothermal Effect [31]. The idea of acoustic wave amplification in bulk material was theoretically predicted by Tolpygo (1956), Uritskii [32], and Weinreich [33] and in N-Ge by Pomerantz [34].…”

Section: Introductionmentioning

confidence: 99%

Hypersound Absorption of Acoustic Phonons in a Degenerate Carbon Nanotube

Dompreh

Mensah²,

Mensah³

et al. 2015

Graphene

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“Currentless” Amplification of Hypersound in a Planar Configuration by Inelastic Scattering of Electrons

Cited by 3 publications

References 1 publication

Acoustomagnetoelectric Effect in Graphene Nanoribbon in the Presence of External Electric and Magnetic Fields

Acoustomagnetoelectric Effect in Graphene Nanoribbon in the Presence of External Electric and Magnetic Fields

Amplification of acoustic waves in armchair graphene nanoribbon in the presence of external electric and magnetic fields

Hypersound Absorption of Acoustic Phonons in a Degenerate Carbon Nanotube

Contact Info

Product

Resources

About