scholarly journals Phonon dispersion, Raman spectra, and evidence for spin-phonon coupling in MnV2O4 from first principles

2020 ◽  
Vol 101 (20) ◽  
Author(s):  
Dibyendu Dey ◽  
T. Maitra ◽  
U. V. Waghmare ◽  
A. Taraphder
Keyword(s):  
Raman Spectra ◽  
First Principles ◽  
Phonon Dispersion ◽  
Phonon Coupling

scholarly journals Resonance and antiresonance in Raman scattering in GaSe and InSe crystals

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
M. Osiekowicz ◽  
D. Staszczuk ◽  
K. Olkowska-Pucko ◽  
Ł. Kipczak ◽  
M. Grzeszczyk ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Temperature Effect ◽  
Band Gap ◽  
Raman Spectra ◽  
Quantum Interference ◽  
Optical Band Gap ◽  
Phonon Coupling ◽  
Phonon Modes ◽  
Electron Phonon Coupling ◽  
Resonant Raman

AbstractThe temperature effect on the Raman scattering efficiency is investigated in $$\varepsilon$$ ε -GaSe and $$\gamma$$ γ -InSe crystals. We found that varying the temperature over a broad range from 5 to 350 K permits to achieve both the resonant conditions and the antiresonance behaviour in Raman scattering of the studied materials. The resonant conditions of Raman scattering are observed at about 270 K under the 1.96 eV excitation for GaSe due to the energy proximity of the optical band gap. In the case of InSe, the resonant Raman spectra are apparent at about 50 and 270 K under correspondingly the 2.41 eV and 2.54 eV excitations as a result of the energy proximity of the so-called B transition. Interestingly, the observed resonances for both materials are followed by an antiresonance behaviour noticeable at higher temperatures than the detected resonances. The significant variations of phonon-modes intensities can be explained in terms of electron-phonon coupling and quantum interference of contributions from different points of the Brillouin zone.

New graphane: inspiration from the structure correlation with phosphorene

2021 ◽  
Author(s):  
Linxin He ◽  
Xinxin Li ◽  
Xin Zhu ◽  
Jianglei Luo ◽  
Zhiqian Chen ◽  
...  
Keyword(s):  
Raman Spectra ◽  
Phonon Dispersion ◽  
Vibration Modes ◽  
Energy Reserves ◽  
Structure Correlation ◽  
Photoelectric Devices

The application of phosphorene and graphane in different photoelectric devices and energy reserves has attracted wide attention. Here, we investigated the Raman spectra, phonon dispersion and vibration modes of four...

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