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Inelastic light scattering by 2D electron system with SO interaction
Alexander V Chaplik1, Lev I Magarill, Ritta Z Vitlina
1Institute of Semiconductor Physics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, 630090, Russia. levm@isp.nsc.ru.
Nanoscale Research Letters
|October 2, 2012
Summary
Rashba spin-orbit interaction in 2D systems enables plasmon peaks in light scattering, even with perpendicular polarizations. The plasmon peak amplitude is sensitive to the spin-orbit coupling sign.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Two-dimensional (2D) electron systems exhibit unique electronic properties.
- Spin-orbit interaction (SOI) significantly influences electron behavior in semiconductors.
- Inelastic light scattering is a key probe for electronic excitations in materials.
Purpose of the Study:
- To theoretically investigate inelastic light scattering by electrons in 2D systems.
- To analyze the impact of Rashba spin-orbit interaction (SOI) on scattering spectra.
- To explore resonance scattering conditions in AIIIBV-type semiconductors.
Main Methods:
- Theoretical analysis of inelastic light scattering.
- Consideration of Rashba spin-orbit interaction in the conduction band.
- Investigation under resonance scattering conditions (light frequencies near interband transitions).
Main Results:
- The plasmon peak appears in scattering spectra even with perpendicular polarizations, unlike in the absence of SOI.
- Specific geometries allow observation of spectrum features due to single-particle transitions.
- The plasmon peak amplitude demonstrates sensitivity to the sign of the SOI coupling.
Conclusions:
- Rashba SOI fundamentally alters inelastic light scattering signatures in 2D systems.
- The presence and characteristics of the plasmon peak provide insights into SOI strength and sign.
- This work offers a pathway for probing spin-dependent electronic properties via optical methods.
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