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

Abstract

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

Semiconductor Fluorinated Carbon Nanotube as a Low Voltage Current Amplifier Acoustic Device

“…and substituting Equation 14- (20) into Equation (12), with a little bit of algebra, we obtain the AE current density as:…”

“…This causes a momentum transfer from the sound wave to the electrons that leads to an attenuation of the acoustic wave [3]. For most of the conduction electrons, this component of velocity will be much larger in magnitude than the speed of the acoustic wave, so that these electrons are "out of phase" in relation to the propagating electric field, thus creating the so-called acoustoelectric effect (AE) [4] acoustomagnetoelectric effect [12], acoustothermal effect [13] and acoustomagnetothermal effect [13]. Recently, AE was studied in semiconductor fluorinated carbon nanotube (FSWCNT) with double periodic band in the absence of an external electric field [14].…”

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

“…Materials such as homogenous semiconductors, Superlattices (SL), Graphene and Carbon Nanotubes (CNT) are good candidates for such studies due to their properties such as the high scattering mechanism, the high-bias meanfree path (l) and their sizes which enable strong electron-phonon interaction to occur in them resulting in acoustic phonon scattering. Acoustic waves through these materials are characterized by a set of elementary resonance excitations and dynamic non-linearity which normally lead to an absorption (or amplification), Acoustoelectric Effect (AE) [2] and Acoustomagnetoelectric Effect (AME) [3,4]. The concept of acoustic wave amplification in bulk materials was predicted by Tolpygo and Uriskii(1956) [5], and in N-Ge by Pomerantz [6].…”

Acoustoelectric effect in graphene with degenerate energy dispersion

“…Acoustoelectric effect (AE) in Bulk and Low-dimensional semiconducting materials has been extensively studied both experimentally [1, 2, 3, 4, 5, 6,7] and theoretically [8,9,10,11]. Recently, AE studies in Nano materials such as Graphene [12,13,14,15,16] and Carbon Nanotube (CNT) [17,18,19,20] has attracted special attention. This is due to the remarkable electrical and mechanical properties of these materials especially the extreme electron mobility which persist at room temperatures.…”