Wu, Q., Fang, D., Ma, Y., Zhu, Y., Dai, X., Gao, Y., Dong, S., Yu, Z., Qian, P., Geng, J., Fan, J., Chen, B. (2025). Doping optimization of charge state stability for shallow nitrogen-vacancy center ensembles in HPHT diamonds. Applied Physics Letters. https://doi.org/10.1063/5.0264044