Raman scattering on silicon nanowires: The thermal conductivity of the environment determines the optical phonon frequency

2006 ◽  
Vol 88 (23) ◽  
pp. 233114 ◽  
Author(s):  
H. Scheel ◽  
S. Reich ◽  
A. C. Ferrari ◽  
M. Cantoro ◽  
A. Colli ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Raman Scattering ◽  
Silicon Nanowires ◽  
Optical Phonon ◽  
Phonon Frequency ◽  
Optical Phonon Frequency

Strain-Induced Shift of Optical Phonon Frequency in InGaP Layers Grown on GaAs Substrates

1987 ◽  
Vol 26 (Part 2, No. 10) ◽  
pp. L1597-L1600 ◽  
Author(s):  
Takamasa Kato ◽  
Takashi Matsumoto ◽  
Mitsuru Hosoki ◽  
Tetsuro Ishida
Keyword(s):  
Optical Phonon ◽  
Phonon Frequency ◽  
Gaas Substrates ◽  
Optical Phonon Frequency

Raman Study of Strain and Confinement Effects in Si/Ge Strained Layer Superlattices Under Hydrostatic Pressure

1991 ◽  
Vol 220 ◽  
Author(s):  
Zhifeng Sui ◽  
Irving P. Herman ◽  
Joze Bevk
Keyword(s):  
Hydrostatic Pressure ◽  
Raman Scattering ◽  
Optical Phonon ◽  
Phonon Frequency ◽  
Optical Phonons ◽  
Biaxial Strain ◽  
Strained Layer ◽  
Strained Layer Superlattice ◽  
Raman Study ◽  
Strained Layer Superlattices

ABSTRACTThe effects of strain and confinement on optical phonons in a Si12Ge4 strained layer superlattice grown by MBE on c-Si (001) were studied as a function of hydrostatic pressure (T = 295 K) using Raman scattering. The change of phonon frequency with pressure, dω/dP, for the principal quasi-confined LO mode in the Ge layers is found to be significantly smaller than that for bulk crystalline Ge because the magnitude of biaxial strain decreases in the Ge layers with added pressure and because the Grüneisen parameter of the confined mode is smaller than that of the Γ-point optical phonon. More generally, it is noted that the magnitude of biaxial strain in many strained layer superlattices initially decreases with the application of hydrostatic pressure, making the structures more stable.

Application of the nonuniform-field treatment to the infrared properties of LiF

1969 ◽  
Vol 47 (1) ◽  
pp. 51-64 ◽  
Author(s):  
A. J. Beaulieu
Keyword(s):  
Thin Films ◽  
Optical Phonon ◽  
Phonon Frequency ◽  
Quantitative Agreement ◽  
Longitudinal Optical ◽  
Optical Frequency ◽  
Nonuniform Field ◽  
Optical Phonon Frequency ◽  
Experimental Values ◽  
Comparison Of The Results

The "nonuniform-field treatment" developed earlier for infinitely thick crystals is applied to the LiF crystal. Comparison with experimental results both at 45° and at small angles of incidence gives good quantitative agreement only when the ratio of the longitudinal optical frequency to the transverse optical frequency is assumed to be 1.7 instead of 2.2 as predicted by the Lyddane–Sach–Teller relation. An extension of the treatment to thin films is presented and the comparison of the results with Berreman's experimental values indicates that the asymmetry and the amplitude of the features which could not be explained before can be predicted in terms of the nonuniform-field treatment, again provided the optical phonon frequency ratio is 1.7.

scholarly journals The influence of atoms of second coordination sphere on phonon dispersion of diamond

2020 ◽  
pp. 111-113
Author(s):  
V. A. Sachkov ◽  
Keyword(s):  
Raman Scattering ◽  
Interaction Energy ◽  
Coordination Sphere ◽  
Phenomenological Model ◽  
Optical Phonon ◽  
Phonon Frequency ◽  
Phonon Dispersion ◽  
Longitudinal Optical ◽  
Optical Phonons ◽  
Second Coordination Sphere

Within the framework of the phenomenological model of twoparticle interaction, the effect of the interaction energy of atoms from the second coordination sphere on the phonon dispersion is considered. This approach makes it possible to vary the growth of the phonon frequency relative to the optical phonon in the center of the Brillun zone. The effects of the contribution to the Raman spectra from longitudinal optical phonons with frequencies higher than their frequency at the center of the Brillouin zone are discussed. The contribution to the frequency of interaction of atoms from the second coordination sphere for some phonons is obtained in an explicit form. The formulas obtained will be useful for calculating the spectra of Raman scattering of light by optical phonons localized in diamond nanocrystals

Sign in / Sign up

Export Citation Format

Share Document