Berlin 2024 – scientific programme

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QI: Fachverband Quanteninformation

QI 18: Poster II

QI 18.25: Poster

Wednesday, March 20, 2024, 11:00–14:30, Poster A

Optimizing Diamond Substrates for Electrical Readout of Nitrogen-Vacancy Centers — •Jonas Wiebe, Lina Maria Todenhagen, and Martin S. Brandt — Walter Schottky Institut and School of Natural Sciences, Technische Universität München, Am Coulombwall 4, 85748 Garching, Germany

Due to its remarkable room temperature properties, the nitrogen-vacancy (NV) center in diamond is a highly interesting quantum system for practical applications, particularly in the field of quantum sensing. The spin state of the NV center can be read out by either optically or electrically detected magnetic resonance (ODMR or EDMR, respectively), with EDMR offering specific advantages for miniaturization and device integration. However, the much less investigated electrical readout encounters very different challenges than its optical counterpart. Notably, the presence of a spin-independent background current from other defects, such as the nitrogen donor N_s⁰, represents a critical and unique aspect in EDMR. In this study, we use helium ion irradiation on different diamond materials to specifically tune the NV to N_s⁰ concentration and investigate the EDMR and ODMR performance of these samples across different irradiation doses.

Keywords: NV Center; Quantum Sensing; Electrical Readout; Diamond; Helium Ion Irradiation