Modeling of Transition Metal Color Centers in Diamond

Sen Zhang, Benjian Liu, Jiwen Zhao +13 more

Zanelli G., Moreva E., Bernardi E. +6 more

Yuhang Guo, Wei Zhu, Jiaxin Zhao +4 more

Electrically driven emission of nitrogen-vacancy (NV) color centers in diamond has recently emerged as a viable candidate for quantum photonics. However, it is challenging to efficiently excite NV centers by an electric field because of the low density of free carriers in doped diamond. Here, we report efficient electroluminescence of neutrally charged nitrogen-vacancy (NV0) color centers under a high electric field (105 V/cm) and study its Stark effect in a MIM (Metal–Insulator–Metal) diamond device. The MIM device was fabricated by electron beam evaporating molybdenum electrodes and microwave plasma chemical vapor depositing a nitrogen-doped diamond epilayer successively on a single-crystal diamond substrate. We demonstrate the field dependence of the electrically driven emission and extract the NV0 ground state electric field susceptibility of 15.83 ± 0.86 GHzmMV−1 from the Stark effect at 5.5 K. Our findings provide a perspective toward electrically exciting color centers in diamond and help one to understand the inherent features of NV0.

Gergő Thiering, Ádám Gali

Xin Tan, Zhixin Liu, Zhiyu Liu +3 more

First-principles analyses are performed on the diamond europium vacancy (EuV) color center. Three different models indicate that the structure of the EuV color center contains a stable vacancy around the Eu atom. Energy band calculations show that the stable EuV color center has spin polarization and its spin-up energy level structure is highly suitable as a single-photon source. The zero-point transition energy is 1.989 eV (623 nm). The existence of metastable energy levels in the EuV is also predicted. Nitrogen atoms have a negative impact on the electronic structure of the EuV, in comparison to diamond color centers such as NE8 and TiV-N.

Brevoord, J.M.