Decoherence of ensembles of nitrogen-vacancy centers in diamond

By E. Bauch, Swati Singh, Junghyun Lee, C. Hart, J. Schloss, M. Turner, J. Barry, L. Pham, N. Bar-Gill, S. Yelin and 1 more. 2020

180 citations recorded by the source corpus.

We present a combined theoretical and experimental study of solid-state spin decoherence in an electronic spin bath, focusing specifically on ensembles of nitrogen-vacancy (NV) centers in diamond and the associated substitutional nitrogen spin bath. We perform measurements of NV spin free-induction decay (FID) times ${T}_{2}^{*}$ and spin-echo coherence times ${T}_{2}$ in 25 diamond samples with nitrogen concentrations [N] ranging from 0.01 to 300 ppm. We introduce a microscopic model and perform numerical simulations to quantitatively explain the degradation of both ${T}_{2}^{*}$ and ${T}_{2}$ over four orders of magnitude in [N]. Our analysis enables us to describe the NV ensemble spin coherence decay shapes as emerging consistently from the contribution of many individual NV centers.

Subfields: Electrical and Electronic Engineering, Materials Chemistry, Mechanics of Materials

View Paper: https://www.semanticscholar.org/paper/19e602311188d35b7ab6a0d9d0cfa96c4a86cfc7