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Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
Published on: April 28, 2016
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Resonance and antiresonance in Raman scattering in GaSe and InSe crystals.
M Osiekowicz1, D Staszczuk1, K Olkowska-Pucko1
1Institute of Experimental Physics, Faculty of Physics, University of Warsaw, ul. Pasteura 5, 02-093, Warszawa, Poland.
Scientific Reports
|January 14, 2021
Summary
Temperature variations reveal resonant and antiresonant Raman scattering in Gallium Selenide (GaSe) and Indium Selenide (InSe) crystals. These effects are linked to electronic band gaps and transitions, influenced by electron-phonon coupling.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spectroscopy
Background:
- Raman scattering is a crucial technique for probing vibrational modes in solids.
- Understanding temperature-dependent optical properties is essential for material applications.
- Gallium Selenide (GaSe) and Indium Selenide (InSe) are layered semiconductors with interesting optoelectronic properties.
Purpose of the Study:
- To investigate the temperature dependence of Raman scattering efficiency in GaSe and InSe.
- To identify conditions for resonant and antiresonant Raman scattering.
- To elucidate the underlying mechanisms of observed phenomena.
Main Methods:
- Temperature-dependent Raman spectroscopy was performed on GaSe and InSe crystals.
- Measurements were conducted over a temperature range of 5–350 K.
- Optical band gap and electronic transition energies were correlated with Raman spectra.
Main Results:
- Resonant Raman scattering was observed in GaSe at ~270 K (1.96 eV excitation) due to optical band gap proximity.
- InSe exhibited resonant Raman spectra at ~50 K (2.41 eV) and ~270 K (2.54 eV) near the B transition.
- Antiresonance behavior followed observed resonances at higher temperatures for both materials.
- Significant variations in phonon-mode intensities were noted.
Conclusions:
- Temperature tuning enables control over resonant and antiresonant conditions in GaSe and InSe.
- Electron-phonon coupling and quantum interference explain intensity variations.
- These findings offer insights into the fundamental optoelectronic properties of these layered semiconductors.
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