Graphene-to-Substrate Energy Transfer through Out-of-Plane Longitudinal Acoustic Phonons

Nano Letters ◽  
2014 ◽  
Vol 14 (3) ◽  
pp. 1317-1323 ◽  
Author(s):  
I-Ju Chen ◽  
Pierre-Adrien Mante ◽  
Cheng-Kai Chang ◽  
Szu-Chi Yang ◽  
Hui-Yuan Chen ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Acoustic Phonons ◽  
Longitudinal Acoustic ◽  
Out Of Plane

Scattering of longitudinal acoustic phonons in thin silicon membranes

2017 ◽  
Author(s):  
Dhruv Gelda ◽  
Marc G. Ghossoub ◽  
Krishna V. Valavala ◽  
Manjunath C. Rajagopal ◽  
Sanjiv Sinha
Keyword(s):  
Acoustic Phonons ◽  
Longitudinal Acoustic ◽  
Thin Silicon ◽  
Silicon Membranes

Turbulent energy transfer in bidimensional numerical models of plasma

2021 ◽  
Author(s):  
Rocio Manobanda ◽  
Christian Vasconez ◽  
Denise Perrone ◽  
Raffaele Marino ◽  
Dimitri Laveder ◽  
...  
Keyword(s):  
Solar Wind ◽  
Energy Transfer ◽  
Numerical Models ◽  
Collisionless Plasma ◽  
Space Plasma ◽  
Turbulent Energy ◽  
Turbulent Medium ◽  
Scaling Properties ◽  
Magnetic Diffusivity ◽  
Out Of Plane

<p>Structured, highly variable and virtually collision-free. Space plasma is an unique laboratory for studying the transfer of energy in a highly turbulent environment. This turbulent medium plays an important role in various aspects of the Solar--Wind generation, particles acceleration and heating, and even in the propagation of cosmic rays. Moreover, the Solar Wind continuous expansion develops a strong turbulent character, which evolves towards a state that resembles the well-known hydrodynamic turbulence (Bruno and Carbone). This turbulence is then dissipated from magnetohydrodynamic (MHD) through kinetic scales by different -not yet well understood- mechanisms. In the MHD approach, Kolmogorov-like behaviour is supported by power-law spectra and intermittency measured in observations of magnetic and velocity fluctuations. In this regime, the intermittent cross-scale energy transfer has been extensively described by the Politano--Pouquet (global) law, which is based on conservation laws of the MHD invariants, and was recently expanded to take into account the physics at the bottom of the inertial (or Hall) range, e.g. (Ferrand et al., 2019). Following the 'Turbulence Dissipation Challenge', we study the properties of the turbulent energy transfer using three different bi-dimensional numerical models of space plasma. The models, Hall-MHD (HMHD), Landau Fluid (LF) and Hybrid Vlasov-Maxwell (HVM), were ran in collisionless-plasma conditions, with an out-of-plane ambient magnetic field, and with magnetic diffusivity carefully calibrated in the fluid models. As each model has its own range of validity, it allows us to explore a long-enough range of scales at a period of maximal turbulence activity. Here, we estimate the local and global scaling properties of different energy channels using a, recently introduced, proxy of the local turbulent energy transfer (LET) rate (Sorriso-Valvo et al., 2018). This study provides information on the structure of the energy fluxes that transfers (and dissipates) most of the energy at small scales throughout the turbulent cascade. </p>

scholarly journals Internal Energy Transfer in Dynamical Behavior of Slightly Curved Shear Deformable Microplates

2015 ◽  
Vol 11 (4) ◽  
Author(s):  
Mergen H. Ghayesh ◽  
Hamed Farokhi ◽  
Gursel Alici
Keyword(s):  
Energy Transfer ◽  
Internal Energy ◽  
Couple Stress Theory ◽  
Dynamical Behavior ◽  
Shear Deformation Theory ◽  
Initial Imperfection ◽  
Modal Interactions ◽  
Initial Curvature ◽  
Out Of Plane ◽  
Transfer Mechanisms

This paper investigates the internal energy transfer and modal interactions in the dynamical behavior of slightly curved microplates. Employing the third-order shear deformation theory, the microplate model is developed taking into account geometric nonlinearities as well as the modified couple stress theory; the initial curvature is modeled by an initial imperfection in the out-of-plane direction. The in-plane displacements and inertia are retained, and the coupled out-of-plane, rotational, and in-plane motion characteristics are analyzed. Specifically, continuous models are developed for kinetic and potential energies as well as damping and external works; these are balanced and reduced via Lagrange's equations along with an assumed-mode technique. The reduced-order model is then solved numerically by means of a continuation technique; stability analysis is performed by means of the Floquet theory. The possibility of the occurrence of modal interactions and internal energy transfers is verified via a linear analysis on different natural frequencies of the system. The nonlinear resonant response of the system is obtained for the cases with internal energy transfer, and energy transfer mechanisms are analyzed; as we shall see, the presence of an initial curvature affects the system dynamics substantially. The importance of taking into account small-size effects is also shown by discovering this fact that both the linear and nonlinear internal energy transfer mechanisms are shifted substantially if this effect is ignored.

scholarly journals Coherent Zone-Folded Longitudinal Acoustic Phonons in Semiconductor Superlattices: Excitation and Detection

1999 ◽  
Vol 82 (5) ◽  
pp. 1044-1047 ◽  
Author(s):  
Albrecht Bartels ◽  
Thomas Dekorsy ◽  
Heinrich Kurz ◽  
Klaus Köhler
Keyword(s):  
Acoustic Phonons ◽  
Semiconductor Superlattices ◽  
Longitudinal Acoustic

Raman scattering by longitudinal acoustic phonons in metallic W/Ti Fibonacci superlattice

1996 ◽  
Vol 80 (7) ◽  
pp. 4063-4066 ◽  
Author(s):  
F. M. Pan ◽  
G. J. Jin ◽  
X. L. Wu ◽  
J. W. Feng ◽  
A. Hu ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Acoustic Phonons ◽  
Longitudinal Acoustic

Attenuation of longitudinal-acoustic phonons in amorphousSiO2at frequencies up to 440 GHz

1991 ◽  
Vol 44 (9) ◽  
pp. 4281-4289 ◽  
Author(s):  
T. C. Zhu ◽  
H. J. Maris ◽  
J. Tauc
Keyword(s):  
Acoustic Phonons ◽  
Longitudinal Acoustic

Resonant Raman Scattering in MoS2

2015 ◽  
Vol 1726 ◽  
Author(s):  
Katarzyna Gołasa ◽  
Magdalena Grzeszczyk ◽  
Przemysław Leszczyński ◽  
Karol Nogajewski ◽  
Marek Potemski ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Optical Emission ◽  
Sample Thickness ◽  
High Symmetry ◽  
Acoustic Phonons ◽  
Longitudinal Acoustic ◽  
Transverse Acoustic ◽  
Raman Modes ◽  
Resonant Raman ◽  
Resonant Raman Scattering

ABSTRACTResonant Raman scattering in molybdenum disulfide (MoS2) is studied as a function of the sample thickness. Optical emission from 1ML, 2ML, 3ML and bulk MoS2 is investigated both at room and at liquid helium temperature. The experimental results are analysed in terms of the recently proposed attribution of the Raman peaks to multiphonon replica involving transverse acoustic phonons from the vicinity of the high-symmetry M point of the MoS2 Brillouin zone. It is shown that the corresponding processes are quenched in a few monolayer samples much stronger than the modes involving longitudinal acoustic phonons. It is also shown that along with the disappearance of multiphonon replica, the Raman modes, which are in-active in bulk become active in a few-monolayer flakes.

Coherent Longitudinal Acoustic Phonons in Three-Dimensional Supracrystals of Cobalt Nanocrystals

Nano Letters ◽  
2013 ◽  
Vol 13 (10) ◽  
pp. 4914-4919 ◽  
Author(s):  
Isabelle Lisiecki ◽  
Dario Polli ◽  
Cong Yan ◽  
Giancarlo Soavi ◽  
Eugène Duval ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Acoustic Phonons ◽  
Longitudinal Acoustic ◽  
Cobalt Nanocrystals
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