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Spin coherence and electromagnetically induced transparency via exciton correlations
1Department of Physics and Oregon Center for Optics, University of Oregon, Eugene, Oregon 97403, USA.
Physical Review Letters
|October 26, 2002
Summary
We demonstrate how Coulomb correlations between excitons with opposite spins induce exciton spin coherence. This spin coherence leads to electromagnetically induced transparency in GaAs quantum wells.
Area of Science:
- Condensed matter physics
- Quantum optics
- Materials science
Background:
- Exciton spin coherence is crucial for quantum information processing.
- Understanding Coulomb correlations is key to controlling exciton dynamics.
Purpose of the Study:
- To experimentally investigate exciton spin coherence induced by Coulomb correlations.
- To demonstrate electromagnetically induced transparency (EIT) in GaAs quantum wells due to this spin coherence.
Main Methods:
- Experimental optical spectroscopy on GaAs quantum wells.
- Analysis of transient optical response.
- Investigating correlations in both bound and unbound exciton pairs.
Main Results:
- Exciton spin coherence was successfully induced via Coulomb correlations.
- Correlations involving both bound and unbound exciton pairs were studied.
- Electromagnetically induced transparency was observed in the transient optical response.
Conclusions:
- Coulomb correlations provide a viable mechanism for inducing exciton spin coherence.
- Observed EIT confirms the role of spin coherence in transient optical phenomena.
- Findings have implications for developing novel quantum optical devices.