Geodesic
High pressure photoluminescence studies of diamond with GeV centers
Nanosistemy: fizika, himiâ, matematika, Tome 9 (2018) no. 1, pp. 67-69.

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We report low temperature (80 K) photoluminescence studies of microcrystalline diamond with germanium-vacancy (GeV) centers under hydrostatic pressure up to 6 GPa. Powders of Ge-doped diamond crystals were synthesized from hydrocarbons at high-pressures and high-temperatures. Due to the high quality of the samples, we were able to resolve the distinct quadruplet structure of the zero-phonon line (ZPL) of the GeV center already at 80 K and to trace it up to $\sim$ 6 GPa. The pressure dependence of ZPL was found to be linear with the pressure coefficient $dE/dP$ = 3.1 meV/GPa, which is nearly 3 times higher than that for the isomorphic SiV$^-$ center. The experimentally observed pressure coefficients of GeV$^-$, NV$^-$ and NV$^0$ centers are compared with results of ab initio DFT calculations, using Quantum ESPRESSO software package.
Keywords: diamond, colour centers, high pressure
Mots-clés : DAC. 
@article{NANO_2018_9_1_a15,
     author = {S. G. Lyapin and A. A. Razgulov and A. P. Novikov and E. A. Ekimov and M. V. Kondrin},
     title = {High pressure photoluminescence studies of diamond with {GeV} centers},
     journal = {Nanosistemy: fizika, himi\^a, matematika},
     pages = {67--69},
     publisher = {mathdoc},
     volume = {9},
     number = {1},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/NANO_2018_9_1_a15/}
}
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S. G. Lyapin; A. A. Razgulov; A. P. Novikov; E. A. Ekimov; M. V. Kondrin. High pressure photoluminescence studies of diamond with GeV centers. Nanosistemy: fizika, himiâ, matematika, Tome 9 (2018) no. 1, pp. 67-69. http://geodesic.mathdoc.fr/item/NANO_2018_9_1_a15/