A theoretical study of de-charging excitations of the NV-center in diamond involving a nitrogen donor

Abstract

The negatively charged nitrogen vacancy centre in diamond is a promising candidate for future nanoscale quantum applications. For its operation it is important to have control of the centres charge state, and to avoid temporary disappearance of the NV-center’s functionality, termed photo-blinking. In this work, we use density functional theory simulations to investigate excitations that result in loss of an electron from NV ^− to a nearby nitrogen donor (donor-N ^+ ), leading to NV ^0 and donor-N ^0 charge state, and the corresponding deexcitation. Since these processes involve two different localized defect centres in the diamond lattice (the NV-center and the donor-N) they are non-local excitations. We have studied the de-charging both as a one-photon process and through a sequential two-photon process via the NV-center excited state. We propose de-charging directly from the NV-center to the donor-N as a possible mechanism for photo-blinking of the NV-center that involve an additional electron spin resonance active defect, the donor-N ^0 . We have found that the excitation energies are converged when the distance between the two is larger than 10.4 Å. We also compute excitations to the conduction band edge from NV ^− (to NV ^0 ) and from donor-N ^0 (to donor-N ^+ ) using G _0 W _0 + BSE.

Keywords

• DFT
• NV-center
• diamond
• ab initio
• GW + BSE
• electron donor