SAMOP 2023 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 23: Poster II (joint session QI/Q)
QI 23.37: Poster
Mittwoch, 8. März 2023, 16:30–19:00, Empore Lichthof
Synthesis of depth confined nitrogen vacancy centers in diamond — •Karolina Schüle1, Christoph Findler1,2, Johannes Lang1,2, and Fedor Jelezko1,3 — 1Institute for Quantum Optics, Ulm University, Ulm, Germany — 2Diatope GmbH, Ummendorf, Germany — 3Center for Integrated Quantum Science and Technology (IQST), Ulm, Germany
The negatively charged nitrogen-vacancy center (NV) is a paramagnetic defect (S=1) in diamond which shows coherence times T2 up to milliseconds even at room temperature. The NV is a promising candidate for quantum applications as its spin state can be initialized, read out optically, and manipulated by a microwave field. One way to fabricate NV centers is ion implantation where nitrogen is added into a single crystal diamond layer followed by an annealing process. The depth of the implanted nitrogen can be adjusted by the implantation energy. Larger kinetic energies are leading to deeper NV centers. At the same time, however, the depth distribution gets also broader limiting the degree of depth confinement. This contradicts the goal of homogeneous properties of the NVs beneficial for e.g. NMR applications. Using the method of indirect overgrowth, where implanted nitrogen is buried below a nanometer-thin capping layer of diamond. The resulting depth of the NV centers is decoupled from the implantation ion energy. Here, we show outstanding depth confinement resulting in single NVs which are located at a depth of around 20 nm confined in a range of approx. 1.4 nm. These NV centers are exhibiting a T2 up to ~100 μs.