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Temperature dependence of the single photon emission from interface-fluctuation GaN quantum dots
F Le Roux1, K Gao, M Holmes2,3
1Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8505, Japan.
Scientific Reports
|November 25, 2017
Summary
Interface-fluctuation Gallium Nitride (GaN) quantum dots emit single photons at temperatures up to 77K. Background emission limits purity, but the quantum dots themselves maintain high single-photon emission quality.
Area of Science:
- Quantum optics
- Solid-state physics
- Materials science
Background:
- Gallium Nitride (GaN) quantum dots are promising for quantum technologies.
- Understanding their single-photon emission properties is crucial for device applications.
- Interface fluctuations can impact quantum emission characteristics.
Purpose of the Study:
- To investigate the temperature-dependent single-photon emission statistics of GaN quantum dots.
- To determine the operational temperature limit for high-purity single-photon emission.
- To analyze the influence of background emission on emission purity.
Main Methods:
- Measurement of second-order photon correlation function (g(2)(0)) at varying temperatures.
- Characterization of single-photon emission from GaN quantum dots.
- Analysis of background emission under different experimental conditions.
Main Results:
- Single-photon emission was confirmed up to approximately 77 Kelvin.
- Background emission significantly degrades purity above this temperature, with g(2)(0) exceeding 0.5.
- Detailed analysis indicates the quantum dots intrinsically maintain high purity.
Conclusions:
- GaN quantum dots exhibit high-purity single-photon emission at cryogenic temperatures.
- Background emission is the primary limitation for purity at higher temperatures.
- These findings are vital for developing GaN-based quantum light sources.
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