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Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR

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Optically erasing disorder in semiconductor microcavities with dynamic nuclear polarization.

T C H Liew¹, V Savona

¹Institute of Theoretical Physics, Ecole Polytechnique Fédérale de Lausanne EPFL, CH-1015 Lausanne, Switzerland.

Physical Review Letters

|May 13, 2011

Summary

This summary is machine-generated.

Photonic disorder in GaAs microcavities significantly decreases with circularly polarized light. This optical pump induces spin-polarized electrons, creating a magnetic field that modifies exciton polaritons.

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Area of Science:

Condensed Matter Physics
Quantum Optics
Semiconductor Spintronics

Background:

Photonic disorder in microcavities affects optical properties.
Exciton polaritons are quasiparticles formed from the interaction of photons and excitons.
Spin dynamics in semiconductors are crucial for spintronic applications.

Purpose of the Study:

To investigate the effect of circularly polarized optical pumping on photonic disorder in GaAs microcavities.
To understand the role of spin-polarized electrons and nuclear spin polarization in modifying exciton polariton potentials.

Main Methods:

Utilized a GaAs-based microcavity.
Applied a circularly polarized continuous wave optical pump.
Analyzed the resulting spin-polarized electron distribution and its impact on photonic disorder.

Main Results:

Achieved a 100-fold reduction in the mean squared value of photonic disorder.
Observed a spatially nonuniform distribution of spin-polarized electrons dependent on the photonic disorder profile.
Demonstrated the induction of a long-living Overhauser magnetic field via hyperfine interaction.

Conclusions:

Circularly polarized optical pumping is an effective method to reduce photonic disorder in semiconductor microcavities.
The generated Overhauser magnetic field can significantly alter exciton polariton properties.
This finding opens new avenues for controlling light-matter interactions in quantum devices.