Spin Light Emitting Diode Based on Exciton Fine Structure Tuning in Quantum Dots
A V Shumilin1,2, T S Shamirzaev3, D S Smirnov1
1Ioffe Institute, 194021 St. Petersburg, Russia.
Physical Review Letters
|March 1, 2024
Summary
We developed a quantum dot light-emitting diode concept producing 100% circularly polarized light without magnetic contacts. This technology enables single circularly polarized photon generation and nuclear spin control in quantum dots.
Area of Science:
- Quantum Optics
- Solid-State Physics
- Nanotechnology
Background:
- Generating circularly polarized light is crucial for quantum information technologies.
- Existing methods often require complex magnetic fields or contacts.
- Quantum dots offer tunable optical properties for light emission.
Purpose of the Study:
- To propose a novel quantum dot light-emitting diode (QD-LED) concept for efficient circularly polarized light emission.
- To explore the generation of single circularly polarized photons using this QD-LED.
- To investigate the control of nuclear spin dynamics within quantum dots.
Main Methods:
- Utilizing hyperfine interaction at exciton level crossings in a weak magnetic field.
- Integrating the quantum dot light-emitting diode concept with micropillar cavities.
- Analyzing second-order photon correlation functions to probe nuclear spin dynamics.
Main Results:
- Achieving electroluminescence circular polarization degrees up to 100%.
- Demonstrating compatibility with micropillar cavities for single photon generation.
- Showing that photon correlation functions reveal nuclear spin dynamics, enabling spin purification via quantum measurement backaction.
Conclusions:
- The proposed quantum dot light-emitting diode concept offers a pathway to efficient, magnetically-contact-free circularly polarized light emission.
- This technology facilitates the generation of single circularly polarized photons.
- Nuclear spin dynamics can be controlled and purified using quantum measurement backaction, advancing quantum control.
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