Regensburg 2022 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 36: Materials and Devices for Quantum Technology 2

HL 36.3: Talk

Thursday, September 8, 2022, 15:30–15:45, H36

Optimizing Diamonds for the Electrical Readout of Nitrogen-Vacancy Centers in Diamond — •Lina Maria Todenhagen, Hamza Ouerfelli, and Martin Stefan Brandt — Walter Schottky Institut, Technische Universität München, Garching

The nitrogen-vacancy (NV) center in diamond is one of the most attractive quantum systems used in practical applications. Owing to its exceptionally stable spin state, it can be easily initialized, manipulated and read out even at room temperature. However, the widely used optical readout (ODMR) of the NV center is not easily miniaturized, since it requires an extensive optical setup. Alternatively, we can directly read out the spins electrically by generating a spin-dependent photocurrent (EDMR). However, compared to the traditional optical readout, EDMR of NV centers has been investigated in much less detail up to now.

The present work addresses the optimization of the diamond host material for the electrical readout and compares the results to the optical analogue. The investigated substrates cover type IIa CVD diamonds as well as type Ib HPHT diamonds, both in their as-grown state and after different post-treatments, including electron irradiation and annealing. We focus on the effects of other defects such as substitutional nitrogen present in the samples on the spin-dependent photocurrent and the achievable contrast. Our results indicate that the choice of diamond material is a lot more critical for EDMR than for ODMR and may serve as a guideline for the further development of highly integrated NV sensors based on electrical readout.