Indium gallium nitride quantum dots: Consequence of random alloy fluctuations for polarization entangled photon emission

We analyze the potential of the \(c\)-plane InGaN/GaN quantum dots for polarization entangled photon emission by means of an atomistic many-body framework. Special attention is paid to the impact of random alloy fluctuations on the excitonic fine structure and the excitonic binding energy. Our calcu...

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Bibliographic Details
Published in:arXiv.org 2020-09
Main Authors: Patra, Saroj Kanta, Schulz, Stefan
Format: Article
Language:English
Subjects:
Binding energy
Emission analysis
Excitons
Fine structure
Gallium nitrides
High temperature
Indium gallium nitrides
Light emission
Mathematical analysis
Photon emission
Photons
Polarization characteristics
Quantum dots
Symmetry
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Summary:We analyze the potential of the \(c\)-plane InGaN/GaN quantum dots for polarization entangled photon emission by means of an atomistic many-body framework. Special attention is paid to the impact of random alloy fluctuations on the excitonic fine structure and the excitonic binding energy. Our calculations show that \(c\)-plane InGaN/GaN quantum dots are ideal candidates for high temperature entangled photon emission as long as the underlying \(C_{3v}\)-symmetry is preserved. However, when assuming random alloy fluctuations in the dot, our atomistic calculations reveal that while the large excitonic binding energies are only slightly affected, the \(C_{3v}\) symmetry is basically lost due to the alloy fluctuations. We find that this loss in symmetry significantly impacts the excitonic fine structure. The observed changes in fine structure and the accompanied light polarization characteristics have a detrimental effect for polarization entangled photon pair emission via the biexciton-exciton cascade. Here, we also discuss possible alternative schemes that benefit from the large excitonic binding energies, to enable non-classical light emission from \(c\)-plane InGaN/GaN quantum dots at elevated temperatures.
ISSN:2331-8422