Enhanced photoelectric detection of NV magnetic resonances in diamond under dual-beam excitation

0474584 - ÚJF 2018 RIV US eng J - Journal Article
Bourgeois, E. - Londero, E. - Buczak, K. - Hruby, J. - Gulka, M. - Balasubramaniam, Y. - Wachter, G. - Štursa, Jan - Dobes, K. - Aumayr, F. - Trupke, M. - Gali, A. - Nesládek, M.
Enhanced photoelectric detection of NV magnetic resonances in diamond under dual-beam excitation.
Physical Review B. Roč. 95, č. 4 (2017), č. článku 041402. ISSN 2469-9950. E-ISSN 2469-9969
R&D Projects: GA MŠMT LM2015056
EU Projects: European Commission(XE) 611143 - DIADEMS
Institutional support: RVO:61389005
Keywords : DIADEMS * diamonds * magnetic measurements * sensors
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.813, year: 2017

The core issue for the implementation of NV center qubit technology is a sensitive readout of the NV spin state. We present here a detailed theoretical and experimental study of NV center photoionization processes, used as a basis for the design of a dual-beam photoelectric method for the detection of NV magnetic resonances (PDMR). This scheme, based on NV one-photon ionization, is significantly more efficient than the previously reported single-beam excitation scheme. We demonstrate this technique on small ensembles of similar to 10 shallow NVs implanted in electronic grade diamond (a relevant material for quantum technology), on which we achieve a cw magnetic resonance contrast of 9%-three times enhanced compared to previous work. The dual-beam PDMR scheme allows independent control of the photoionization rate and spin magnetic resonance contrast. Under a similar excitation, we obtain a significantly higher photocurrent, and thus an improved signal-to-noise ratio, compared to single-beam PDMR. Finally, this scheme is predicted to enhance magnetic resonance contrast in the case of samples with a high proportion of substitutional nitrogen defects, and could therefore enable the photoelectric readout of single NV spins.
Permanent Link: http://hdl.handle.net/11104/0271609