Erlangen 2022 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 41: Nano-Optics
Q 41.10: Poster
Mittwoch, 16. März 2022, 16:30–18:30, P
Improving the optical coherence of tin vacancy centres in diamond by long term low temperature and low pressure annealing — •Dennis Herrmann1, Johannes Görlitz1, Philipp Fuchs1, Michael Kieschnik2, Jan Meijer2, and Christoph Becher1 — 1Fachrichtung 7.2, Universität des Saarlandes — 2Applied Quantum Systems, Felix-Bloch Institute for Solid-State Physics, Universität Leipzig
The negatively charged tin-vacancy (SnV) centre is a promising candidate for applications in QIP combining single photon emission rates exceeding the well-known silicon-vacancy (SiV) centre by a factor of 10 while still offering large Debye-Waller factors, high single photon purity (g2(0)=0.05) and narrow Fourier limited linewidths down to 20 MHz. Furthermore the large ground state splitting of 850 GHz together with an optical stabilization of the defect charge state allows for spin dephasing times on the order of T2*∼ 5 µ s. Since strain being induced during implantation of heavy tin ions dramatically influences the SnV properties a consequent annealing step is crucial to heal the diamond lattice. Up to now a high temperature and high pressure (HPHT, 2100∘C at 7.7 GPa) annealing has shown a strong reduction of implantation-induced strain. As HPHT annealing is an elaborate process we here present an alternative way of reducing strain by a long term annealing procedure at lower temperatures and low pressures (LPLT, 1200 ∘C and vacuum) leading to improved spectral properties such as a narrow inhomogeneous distribution of line positions and reduced linewidths/ground state splittings indicating low strain.