Germanium: a new catalyst for diamond synthesis and a new optically active impurity in diamond

Palyanov, Yuri N.; Kupriyanov, Igor N.; Borzdov, Yuri M.; Surovtsev, N. V.

doi:10.1038/srep14789

Cited by 164 publications

(151 citation statements)

References 33 publications

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“…The use of new growth systems enables production of diamond crystals with unusual and unique properties. For example, superconducting diamonds were obtained in the B-C system [7]; phosphorus-doped crystals were synthesized in the P-C system [8,9]; Ge-doped diamonds were produced using germanium as the solvent-catalyst [10].…”

Section: Introductionmentioning

confidence: 99%

HPHT Diamond Crystallization in the Mg-Si-C System: Effect of Mg/Si Composition

et al. 2017

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Crystallization of diamond in the Mg-Si-C system has been studied at 7.5 GPa and 1800 • C with the Mg-Si compositions spanning the range from Mg-C to Si-C end-systems. It is found that as Si content of the system increases from 0 to 2 wt %, the degree of the graphite-to-diamond conversion increases from about 50 to 100% and remains at about this level up to 20 wt % Si. A further increase in Si content of the system leads to a decrease in the graphite-to-diamond conversion degree down to complete termination of diamond synthesis at Si content >50 wt %. Depending on the Si content crystallization of diamond, joint crystallization of diamond and silicon carbide and crystallization of silicon carbide only are found to take place. The cubic growth of diamond, typical of the Mg-C system, transforms to the cube-octahedron upon adding 1 wt % Si and then to the octahedron at a Si content of 2 wt % and higher. The crystallized diamonds are studied by a suite of optical spectroscopy techniques and the major characteristics of their defect-and-impurity structure are revealed. The correlations between the Si content of the Mg-Si-C system and the properties of the produced diamond crystals are established.

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Section: Introductionmentioning

confidence: 99%

HPHT Diamond Crystallization in the Mg-Si-C System: Effect of Mg/Si Composition

et al. 2017

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“…The GeV center is a new optically active color center in diamond [12][13][14][15]. Its calculated structure, shown in Fig.…”

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confidence: 99%

“…The solid curve is a fit to four Lorentzians. transition at 602 nm which constitutes about 60% of the total emission spectrum [12]. Similar to the negatively-charged SiV center [10,16], the ground state of the GeV center is a spin-doublet (S = 1/2) [17] with double orbital degeneracy.…”

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confidence: 99%

“…Fig. 1(b) depicts the electronic level structure of the GeV [13,14] with a zero-phonon line (ZPL) * mbhaskar@g.harvard.edu † lukin@physics.harvard.edu Photoluminescence spectrum of the GeV at T = 50 K, revealing the four optical transitions predicted by the GeV electronic structure (inset) [12]. ∆1−2 = 152 GHz and ∆3−4 = 981 GHz are the measured ground and excited state orbital splittings respectively.…”

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Quantum Nonlinear Optics with a Germanium-Vacancy Color Center in a Nanoscale Diamond Waveguide

et al. 2017

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We demonstrate a quantum nanophotonics platform based on germanium-vacancy (GeV) color centers in fiber-coupled diamond nanophotonic waveguides. We show that GeV optical transitions have a high quantum efficiency and are nearly lifetime-broadened in such nanophotonic structures. These properties yield an efficient interface between waveguide photons and a single GeV without the use of a cavity or slow-light waveguide. As a result, a single GeV center reduces waveguide transmission by 18 ± 1% on resonance in a single pass. We use a nanophotonic interferometer to perform homodyne detection of GeV resonance fluorescence. By probing the photon statistics of the output field, we demonstrate that the GeV-waveguide system is nonlinear at the single-photon level.Efficient coupling between single photons and coherent quantum emitters is a central element of quantum nonlinear optical systems and quantum networks [1][2][3]. Several atom-like defects in the solid-state are currently being explored as promising candidates for the realization of such systems [4], including the nitrogen-vacancy (NV) center in diamond, renowned for its long spin coherence at room temperature [5]; and the silicon-vacancy (SiV) center in diamond, which has recently been shown to have strong, coherent optical transitions in nanostructures [6][7][8][9]. The remarkable optical properties of the SiV center arise from its inversion symmetry [10], which results in a vanishing permanent electric dipole moment for SiV orbital states, dramatically reducing their response to charge fluctuations in the local environment.

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“…Therefore, active research has also been undertaken to find out other optical centers in diamond with properties suitable for the novel applications [32]. Recently, silicon-vacancy [33,34], germanium-vacancy [35][36][37], and tin-vacancy [38,39] centers have been demonstrated to possess characteristics that are promising for single-photon applications. In addition, attempts at creating optical centers related to other impurities in diamond, such as Ni [40], Cr [41], and Eu [42] have been reported.…”

Section: Some Facets Of Synthetic Diamond Crystalsmentioning

confidence: 99%

The Many Facets of Diamond Crystals

Palyanov

2018

Crystals

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This special issue is intended to serve as a multidisciplinary forum covering broad aspects of the science, technology, and application of synthetic and natural diamonds. This special issue contains 12 papers, which highlight recent investigations and developments in diamond research related to the diverse problems of natural diamond genesis, diamond synthesis and growth using CVD and HPHT techniques, and the use of diamond in both traditional applications, such as mechanical machining of materials, and the new recently emerged areas, such as quantum technologies. The results presented in the contributions collected in this special issue clearly demonstrate that diamond occupies a very special place in modern science and technology. After decades of research, this structurally very simple material still poses many intriguing scientific questions and technological challenges. It seems undoubted that diamond will remain the center of attraction for many researchers for many years to come.

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Germanium: a new catalyst for diamond synthesis and a new optically active impurity in diamond

Cited by 164 publications

References 33 publications

HPHT Diamond Crystallization in the Mg-Si-C System: Effect of Mg/Si Composition

HPHT Diamond Crystallization in the Mg-Si-C System: Effect of Mg/Si Composition

Quantum Nonlinear Optics with a Germanium-Vacancy Color Center in a Nanoscale Diamond Waveguide

The Many Facets of Diamond Crystals

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