PhD Title: Identification of defects in diamond via optically-detected magnetic resonance

PhD Supervisor: Dr. Ben Green，Prof. Mark Newton

Sponsor: De Beers Ignite; China Scholarship Council(CSC)

Synopsis of research: Diamond has great potential in quantum information applications and atomic-scale sensing which is achieved via its defects such as nitrogen-vacancies (NV) and silicon-vacancies (SiV). These defects in diamond can only be technologically exploited if they are in a stable charge state. For example, the silicon vacancy acts as a good emitter of coherent photons in negative charge states but possesses no optical emission in the SiV^(2-) state. Therefore, to exploit quantum applications of silicon vacancy centers, it is important to understand their charge-state dynamics and the processes which can drive between them. In my work, I study the charge transfer of SiV defects in various states as well as other defects involved via investigating a set of high nitrogen high silicon CVD synthetic diamonds. Apart from the charge state dynamics of defects in diamonds, I also study some interesting unknown features and defects of diamonds.

Education:

2019-present: PhD in Physics, University of Warwick

2016-2019: MSc in Gemmology China University of Geosciences, Beijing

2012-2016: BSc in Gemmology and Material Science, China University of Geosciences, Beijing

2014-2015: Award Gemmology Diploma of the Gemmological Association of Great Britain(FGA)

Employment history

2017-2019: General assistant of chief scientist (internship)

National gems & jewelry technology administrative Center(NGTC), Beijing, China

Prizes:

2015 Second Prize, Diamond Identification Competition

2016 Outstanding Graduates

2018 First class academic scholarship

2018 Merit Student

2019 The first prize of Postgraduate Academic Report Competition

Conferences

November 2019.China international gems & jewelry academic conference. Poster “Application of Fluorescence Lifetime Attenuation Curve in CVD Synthetic Diamond Testing”.

July 2021. 72rd DeBeers diamond conference (Coventry). Poster present. 'Charge-state dynamics of silicon vacancies and silicon-nitrogen-vacancy in highly nitrogen and silicon doped CVD diamond'

March 2022. Hasselt diamond workshop 2022, Poster present. 'Charge-state dynamics of silicon vacancies and other defects in highly nitrogen and silicon doped CVD diamond'

July 2022. 73rd DeBeers diamond conference (Coventry). Poster present. 'Charge-state dynamics of silicon vacancies and other defects in highly nitrogen and silicon doped CVD diamond'

September 2022, 2nd International Conference on Diamond and Carbon Materials (Portugal).Poster present. 'Charge-state dynamics and distributions of defects in highly nitrogen and silicon doped CVD diamond'

October 2022. scientific meeting ‘Diamond for quantum applications’ organized by the royal society(UK)

Publications

[1] B G Breeze, C J Meara, X X Wu, C P Michaels, R Gupta, P L Diggle, M W Dale, B L Cann, T Ardon, U F S D'Haenens-Johansson, I Friel, M J Rayson, P R Briddon, J P Goss, M E Newton, B L Green, Doubly-charged silicon vacancy center, photochromism, and Si-N complexes in co-doped diamond. arXiv:2002.01712

[2] Wu Xuxu, Lu Taijin, et al. Gemological characteristics of CVD synthetic diamonds from Ningbo Crysdiam and comparison with IIa companies.Journal of Gems & Gemmology. 2019,21(06):15-23.

[3] Wu Xuxu, Lu Taijin, et al. Observation of Surface Microstructure Of HPHT Synthetic Diamond Crystals. Rock And Mineral Analysis. 2019,38(04):411-417.

[4] Xuxu Wu, Taijin Lu, et al. Observation of etched surface micro-features on HPHT synthetic diamonds using laser confocal microscopy(LCM). Gems & Gemology, Spring 2018, Vol. 54, No. 2，246-248.

Patent

Zhang Jian, Lu taijin, Wu xuxu. External Detection Device for Electrical Conductivity Testing of Gemstone Minerals. An Utility Model Patent, China.

Master thesis

Wu Xuxu. Gemological Properties of Domestic Colorless CVD (Chemical Vapor Deposition)Synthetic Diamonds and Hybrid Diamonds. China university of geosciences(Beijing).2019.