Dynamics of Dirac quasi-particles in lattice vibration and anomalous phonon frequency shift of graphene

2011 ◽  
Vol 151 (10) ◽  
pp. 785-789 ◽  
Author(s):  
Ye Xiong
Keyword(s):  
Frequency Shift ◽  
Phonon Frequency ◽  
Lattice Vibration

scholarly journals Anharmonic phonon frequency shift inMgB2

2003 ◽  
Vol 68 (22) ◽  
Author(s):  
Michele Lazzeri ◽  
Matteo Calandra ◽  
Francesco Mauri
Keyword(s):  
Frequency Shift ◽  
Phonon Frequency

Mechanism of Defect Reactions in Semiconductors

2009 ◽  
Vol 1195 ◽  
Author(s):  
Yuzo Shinozuka
Keyword(s):  
Lattice Distortion ◽  
Phonon Frequency ◽  
Lattice Vibration ◽  
Lattice Relaxation ◽  
Structural Instability ◽  
Carrier Injection ◽  
Jahn Teller ◽  
Jahn Teller Effect ◽  
Defect Reactions ◽  
Hole Localization

AbstractProposed mechanisms so far on defect reactions in semiconductors are reexamined. Structural instability of point defects is explained in terms of the Jahn-Teller effect. It is found that the tetrahedral coordinated bonds, which do not have inversion symmetry, are not so rigid as we consider, especially for hole localization. Second topic is the phonon-kick mechanism for defect reactions under carrier injection. In order to discuss this mechanism in detail, we recall the configuration coordinate (c-c) diagram, which is often misunderstood in the literature. The proper relation is explained among the lattice distortion, the position of the electronic level in the band gap (thermal and optical depths), the total energy the multiphonon (e and h) carrier capture processes and the following induced lattice relaxation. A numerical simulation has been performed on phonon kick mechanism. It is found that a rapid increase of the transient lattice vibration around the defect is possible and the probability critically depends on the carrier concentrations and the phonon frequency distribution.

Raman Scattering Spectroscopy of GeSi/Si Strained Layer Superlattice

1993 ◽  
Vol 298 ◽  
Author(s):  
Zhang Rong ◽  
Zheng Youdou ◽  
Gu Shulin ◽  
Hu Liqun
Keyword(s):  
Raman Scattering ◽  
Frequency Shift ◽  
Raman Spectra ◽  
Strain Distribution ◽  
Phonon Frequency ◽  
New Method ◽  
Raman Scattering Spectroscopy ◽  
Scattering Measurements ◽  
Optic Phonon ◽  
Strained Layer Superlattice

AbstractRaman scattering measurements have been carried out on Si1-xGex/Si SLS. It is found that the Ge–Ge optic phonon frequency shift is proportional to strain in the SiGe film, and the Ge–Ge strain shift coefficient is 408cm−1. Based on these study a new method for analyzing the Raman spectra of SiGe/Si SLS has been proposed. Using the new method we can obtain the composition of the alloy sublayers as well as the strain in SLS. The strain distribution in the SiGe/Si SLS has been discussed, and strain in both SiGe and Si sublayers of the SLS have been calculated.

Observation of the correlation between the phonon frequency and long-range magnetic ordering on a MnW octacyanide molecule–based magnet

2021 ◽  
Author(s):  
Hiroko Tokoro ◽  
Naotaka Maeda ◽  
Kenta Imoto ◽  
Koji Nakabayashi ◽  
Kouji Chiba ◽  
...  
Keyword(s):  
Phase Transition ◽  
Frequency Shift ◽  
Long Range ◽  
Magnetic Phase Transition ◽  
Phonon Frequency ◽  
Magnetic Phase ◽  
Magnetic Ordering ◽  
Anomalous Change

We show an anomalous change in the phonon frequency at the magnetic phase transition on a cyanide-bridged bimetal assembly, Mn3[W(CN)8]2(pyrimidine)4·6H2O. This compound shows a frequency shift in the CN stretching...

Optical Spectrum Analyses of ZnS1-XSex Ternary Material

2012 ◽  
Vol 490-495 ◽  
pp. 3491-3494
Author(s):  
Xiao Yan Zhang ◽  
Guo Liang Fan
Keyword(s):  
Phonon Frequency ◽  
Random Element ◽  
Lattice Vibration ◽  
Wave Length ◽  
Dielectric Constants ◽  
Mode Behavior ◽  
Reflectivity Spectra ◽  
Ft Ir ◽  
Relationship Of ◽  
The Relationship

The lattices motion equation and Born-Huang equation was established with the framework of modified random-element-isodisplacement (MREI) model, and the relationship of dielectric constants of lattice vibration and FT-IR reflectivity spectra in ternary mixed crystals ZnS1-xSex with the changes of composition x are discussed. The two-mode behavior of long-wave length optical phonon was studied, and the relation of TO-phonon frequency and LO-phonon frequency with composition was obtained.

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