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Coherence of elementary excitations in a disordered electron system.
Yu A Pusep1, M B Ribeiro, V E Carrasco
1Instituto de Fisica de São Carlos, Universidade de São Paulo, Brazil.
Physical Review Letters
|May 21, 2005
Summary
Disordered GaAs/AlGaAs superlattices show that individual electrons localize less than collective excitations. This indicates disorder affects collective electron motion more significantly, increasing localization.
Area of Science:
- Condensed matter physics
- Materials science
- Semiconductor physics
Background:
- Disordered semiconductor superlattices exhibit complex electronic properties.
- Understanding electron localization is crucial for device performance.
Purpose of the Study:
- Investigate localization properties of single-particle and collective electron excitations.
- Analyze the impact of intentional disorder in GaAs/AlGaAs superlattices.
Main Methods:
- Weak-field magnetoresistance measurements.
- Raman scattering spectroscopy.
Main Results:
- Localization length of individual electrons is significantly larger than that of collective excitations.
- Disorder impacts collective electron motion more than individual electrons.
Conclusions:
- Electron-electron interactions in collective excitations enhance localization.
- Intentional disorder affects collective electron dynamics more profoundly than single-particle behavior.