Field-effect detected magnetic resonance of NV centers in diamond based on all-carbon Schottky contacts

Citation: Le, Xuan Phuc, et al. “Field-effect detected magnetic resonance of NV centers in diamond based on all-carbon Schottky contacts.” arXiv preprint arXiv:2504.11192 (2025).

Authors: Le, Xuan Phuc, et al. 

Publication location: arXiv (identifier arXiv: 2504.11192)

Date: 15 April 2025

DOI: https://doi.org/10.48550/arXiv.2504.11192 

Abstract:

The nitrogen vacancy (NV) center is a defect in diamond whose spin state can be read optically by exploiting its photoluminescence or electrically by exploiting its charge generation rate under illumination, both of which being spin-dependent. The latter method offers numerous opportunities in terms of integration and performance compared to conventional optical reading. Here, we investigate the physical properties of a graphitic-diamond-graphitic structure under illumination. We show how, for a type IIa diamond material, electron-hole pairs generated by an ensemble of NV centers lead to a p-type material upon illumination, making this all-carbon structure equivalent to two back-to-back Schottky diodes. We analyze how the reverse current flowing upon illumination changes as a function of bias voltage and radiofrequency-induced excitation of the NV ensemble spin resonances. Furthermore, we demonstrate how an additional field effect arising from the illumination scheme affects the reverse current, resulting in a photoelectrical signal that can exceed the optical signal under the same illumination conditions.