Inelastic interaction of nonequilibrium electrons with acoustic phonons at low lattice temperatures

1996 ◽  
Vol 53 (11) ◽  
pp. 6885-6888 ◽  
Author(s):  
N. Chakrabarti ◽  
D. P. Bhattacharya
Keyword(s):  
Inelastic Interaction ◽  
Acoustic Phonons

scholarly journals Elastic Properties of Taurine Single Crystals Studied by Brillouin Spectroscopy

2021 ◽  
Vol 22 (13) ◽  
pp. 7116
Author(s):  
Dong Hoon Kang ◽  
Soo Han Oh ◽  
Jae-Hyeon Ko ◽  
Kwang-Sei Lee ◽  
Seiji Kojima
Keyword(s):  
Structural Phase ◽  
Inelastic Interaction ◽  
Infrared Range ◽  
Structural Studies ◽  
Acoustic Phonons ◽  
Brillouin Spectroscopy ◽  
Normal Lattice ◽  
Acoustic Absorption Coefficient ◽  
Temperature Dependences ◽  
First Time

The inelastic interaction between the incident photons and acoustic phonons in the taurine single crystal was investigated by using Brillouin spectroscopy. Three acoustic phonons propagating along the crystallographic b-axis were investigated over a temperature range of −185 to 175 °C. The temperature dependences of the sound velocity, the acoustic absorption coefficient, and the elastic constants were determined for the first time. The elastic behaviors could be explained based on normal lattice anharmonicity. No evidence for the structural phase transition was observed, consistent with previous structural studies. The birefringence in the ac-plane indirectly estimated from the split longitudinal acoustic modes was consistent with one theoretical calculation by using the extrapolation of the measured dielectric functions in the infrared range.

Spatial resolution of X-ray microanalysis in thin foils

1978 ◽  
Vol 36 (1) ◽  
pp. 544-545
Author(s):  
R. Hutchings ◽  
I.P. Jones ◽  
M.H. Loretto ◽  
R.E. Smallman
Keyword(s):  
Spatial Resolution ◽  
Electron Probe ◽  
Beam Divergence ◽  
Inelastic Interaction ◽  
Specimen Thickness ◽  
High Current ◽  
Beam Spreading ◽  
X Ray ◽  
Thin Foils ◽  
Complex Calculation

There is increasing interest in X-ray microanalysis of thin specimens and the present paper attempts to define some of the factors which govern the spatial resolution of this type of microanalysis. One of these factors is the spreading of the electron probe as it is transmitted through the specimen. There will always be some beam-spreading with small electron probes, because of the inevitable beam divergence associated with small, high current probes; a lower limit to the spatial resolution is thus 2αst where 2αs is the beam divergence and t the specimen thickness.In addition there will of course be beam spreading caused by elastic and inelastic interaction between the electron beam and the specimen. The angle through which electrons are scattered by the various scattering processes can vary from zero to 180° and it is clearly a very complex calculation to determine the effective size of the beam as it propagates through the specimen.

ACOUSTIC PHONONS IN HEISENBERG PARAMAGNETS

1971 ◽  
Vol 32 (C1) ◽  
pp. C1-526-C1-527 ◽  
Author(s):  
H. S. BENNETT
Keyword(s):  
Acoustic Phonons

THEORY OF ACOUSTIC PHONONS AT INTERFACES AND BRILLOUIN SCATTERING

1981 ◽  
Vol 42 (C6) ◽  
pp. C6-804-C6-806
Author(s):  
V. Bortolani ◽  
F. Nizzoli ◽  
G. Santoro ◽  
A. Marvin
Keyword(s):  
Brillouin Scattering ◽  
Acoustic Phonons

Shear Acoustic Phonons in Multilayer Arsenide Semiconductor Nanostructures

2019 ◽  
Vol 11 (1) ◽  
pp. 01019-1-01019-6
Author(s):  
I. V. Boyko ◽  
◽  
M. R. Petryk ◽  
Keyword(s):  
Semiconductor Nanostructures ◽  
Acoustic Phonons

scholarly journals Frequency-domain study of nonthermal gigahertz phonons reveals Fano coupling to charge carriers

2020 ◽  
Vol 6 (51) ◽  
pp. eabd4540
Author(s):  
Thomas Vasileiadis ◽  
Heng Zhang ◽  
Hai Wang ◽  
Mischa Bonn ◽  
George Fytas ◽  
...  
Keyword(s):  
Frequency Domain ◽  
Acoustic Waves ◽  
Lamb Waves ◽  
Charge Carriers ◽  
Acoustic Phonons ◽  
Phonon Spectra ◽  
Electron Hole Plasma ◽  
Nonequilibrium Conditions ◽  
Microelectronic Components ◽  
Anti Stokes

Telecommunication devices exploit hypersonic gigahertz acoustic phonons to mediate signal processing with microwave radiation, and charge carriers to operate various microelectronic components. Potential interactions of hypersound with charge carriers can be revealed through frequency- and momentum-resolved studies of acoustic phonons in photoexcited semiconductors. Here, we present an all-optical method for excitation and frequency-, momentum-, and space-resolved detection of gigahertz acoustic waves in a spatially confined model semiconductor. Lamb waves are excited in a bare silicon membrane using femtosecond optical pulses and detected with frequency-domain micro-Brillouin light spectroscopy. The population of photoexcited gigahertz phonons displays a hundredfold enhancement as compared with thermal equilibrium. The phonon spectra reveal Stokes–anti-Stokes asymmetry due to propagation, and strongly asymmetric Fano resonances due to coupling between the electron-hole plasma and the photoexcited phonons. This work lays the foundation for studying hypersonic signals in nonequilibrium conditions and, more generally, phonon-dependent phenomena in photoexcited nanostructures.

scholarly journals Nonequilibrium thermodynamics of acoustic phonons in suspended graphene

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
Robin J. Dolleman ◽  
Gerard J. Verbiest ◽  
Yaroslav M. Blanter ◽  
Herre S. J. van der Zant ◽  
Peter G. Steeneken
Keyword(s):  
Nonequilibrium Thermodynamics ◽  
Acoustic Phonons ◽  
Suspended Graphene

Probing combinations of acoustic phonons in MoS2 by intervalley double-resonance Raman scattering

2021 ◽  
Vol 103 (4) ◽  
Author(s):  
Rafael N. Gontijo ◽  
Andreij Gadelha ◽  
Orlando J. Silveira ◽  
Ricardo W. Nunes ◽  
Marcos A. Pimenta ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Double Resonance ◽  
Resonance Raman ◽  
Resonance Raman Scattering ◽  
Acoustic Phonons

scholarly journals Coherent control of acoustic phonons in a silica fiber using a multi-GHz optical frequency comb

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Mamoru Endo ◽  
Shota Kimura ◽  
Shuntaro Tani ◽  
Yohei Kobayashi
Keyword(s):  
Coherent Control ◽  
Continuous Wave ◽  
Frequency Comb ◽  
Effective Interaction ◽  
Interaction Strength ◽  
Single Mode ◽  
Optical Frequency Comb ◽  
Material Structure ◽  
Optical Frequency ◽  
Acoustic Phonons

AbstractMulti-gigahertz mechanical vibrations that stem from interactions between light fields and matter—known as acoustic phonons—have long been a subject of research. In recent years, specially designed functional devices have been developed to enhance the strength of the light-matter interactions because excitation of acoustic phonons using a continuous-wave laser alone is insufficient. However, the strength of the interaction cannot be controlled appropriately or instantly using these structurally-dependent enhancements. Here we show a technique to control the effective interaction strength that does not operate via the material structure in the spatial domain; instead, the method operates through the structure of the light in the time domain. The effective excitation and coherent control of acoustic phonons in a single-mode fiber using an optical frequency comb that is performed by tailoring the optical pulse train. This work represents an important step towards comb-matter interactions.

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