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Carbon

Single-photon diamond sources created by nature

Dmitrii G. Pasternak, Alexey M. Romshin, Khmelnitsky R.A., G. Yu Kriulina, Alexander A. Zhivopistsev, O.S. Kudryavtsev, Alexander V. Gritsienko, Сатанин Аркадий Михайлович, Igor I. Vlasov

Published Apr 30, 2026• 2 citations
Publisher
DOI
10.1016/j.carbon.2026.121655

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Practical applications exploiting the quantum nature of light require efficient and bright room-temperature single-photon sources. At present, color centers in diamond are considered to be the most promising candidates. However, their efficient electrical excitation is challenging due to the inability to create a high density of free electrons in diamond. In this work, we predict the superinjection effect in diamond homojunction p-i-n diodes, which enables to inject up to four orders of magnitude more electrons into the i-region than the doping of the n-type region allows. Despite that the superinjection effect is known to be a unique feature of semiconductor heterostructures, we demonstrate for the first time that this effect can also be observed in homojunction diamond diodes, giving the possibility to overcome the doping problem and design bright electrically driven single-photon sources.
An elementary experiment in optics consists of a light source and a detector. Yet, if the source generates nonclassical correlations such an experiment is capable of unambiguously demonstrating the quantum nature of light. We realized such an experiment with a defect center in diamond and a superconducting detector. Previous experiments relied on more complex setups, such as the Hanbury Brown and Twiss configuration, where a beam splitter directs light to two photodetectors, creating the false impression that the beam splitter is a fundamentally required element. As an additional benefit, our results provide a simplification of the widely used photon-correlation techniques.
This thesis is focused on the production and characterization of diamond films and diamond nanoparticles containing custom colour centres. These defects intentionally created into the diamond lattice are promising candidates for single photon sources, and are becoming more important for quantum information technologies as photons can carry quantum information over long distances. With outstanding properties such as up to 80% of the photons emitted into the zero phonon line (ZPL), single photon count rates up to several Mcps under continuous excitation and a narrow ZPL at room temperature, the SiV centre has recently attracted more attention. Although different approaches for the creation of colour centres have been reported, this thesis details the creation of SiV centres by chemical vapour deposition. Colour centres are created through the incorporation of impurities during diamond growth. While Si doping can easily be achieved due to plasma etching of Si substrates or the incorporation of a Si solid source inside the reactor vacuum chamber, controlling the exact amount of Si present in the gas phase or effectively incorporated is still a handicap. Chapters five and six show comprehensive studies performed towards the creation of diamond nanoparticles with single emitters. Control over the Si content within the gas phase is achieved using silane as gas source. The subsequent milling of the diamond films hosting the SiV centres and their inclusion into a stable solution, will facilitate SiV coupling and incorporation into cavities or emission-enhancer devices.