Optical properties of SiV and GeV color centers in nanodiamonds under hydrostatic pressures up to 180 GPa

Vindolet, Baptiste and Adam, Marie-Pierre and Toraille, Loic and Chipaux, Mayeul and Hilberer, Antoine and Thiering, Gergő and Dupuy, Géraud and Razinkovas, Lukas and Alkauska, Audrius and Thiering, Gergő and Gali, Ádám and De Feudis, Mary and Ngandeu Ngambou, Midrel Wilfried and Achard, Jocelyn and Tallaire, Alexandre and Schmidt, Martin and Becher, Christoph and Roch, Jean-François (2022) Optical properties of SiV and GeV color centers in nanodiamonds under hydrostatic pressures up to 180 GPa. PHYSICAL REVIEW B, 106 (21). No-214109. ISSN 2469-9950

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Abstract

We investigate the optical properties of silicon-vacancy (SiV) and germanium-vacancy (GeV) color centers in nanodiamonds under hydrostatic pressure up to 180 GPa. The nanodiamonds were synthesized by Si- or Ge- doped plasma-assisted chemical vapor deposition and, for our experiment, pressurized in a diamond anvil cell. Under hydrostatic pressure we observe blueshifts of the SiV and GeV zero-phonon lines by 17 THz (70 meV) and 78 THz (320 meV), respectively. These measured pressure-induced shifts are in good agreement with ab initio calculations that take into account the lattice compression based on the equation of state of diamond and that are extended to the case of the tin-vacancy (SnV) center. This work provides guidance on the use of group-IV-vacancy centers as quantum sensors under extreme pressures that will exploit their specific optical and spin properties induced by their intrinsic inversion-symmetric structure.

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