Spectral stability of V2 centres in sub-micron 4H-SiC membranes

• URL: http://arxiv.org/abs/2310.12617v4
• Date: Mon, 13 May 2024 12:19:27 GMT
• Title: Spectral stability of V2 centres in sub-micron 4H-SiC membranes
• Authors: Jonah Heiler, Jonathan Körber, Erik Hesselmeier, Pierre Kuna, Rainer Stöhr, Philipp Fuchs, Misagh Ghezellou, Jawad Ul-Hassan, Wolfgang Knolle, Christoph Becher, Florian Kaiser, Jörg Wrachtrup,
• Abstract summary: Colour centres in silicon carbide emerge as a promising semiconductor quantum technology platform. We show that silicon vacancy centres can be integrated into sub-micron silicon carbide membranes.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Colour centres in silicon carbide emerge as a promising semiconductor quantum technology platform with excellent spin-optical coherences.However, recent efforts towards maximising the photonic efficiency via integration into nanophotonic structures proved to be challenging due to reduced spectral stabilities. Here, we provide a large-scale systematic investigation on silicon vacancy centres in thin silicon carbide membranes with thicknesses down to $0.25\,\rm\mu m$. Our membrane fabrication process involves a combination of chemical mechanical polishing, reactive ion etching, and subsequent annealing. This leads to highly reproducible membranes with roughness values of $3-4\,\rm\r{A}$, as well as negligible surface fluorescence. We find that silicon vacancy centres show close-to lifetime limited optical linewidths with almost no signs of spectral wandering down to membrane thicknesses of $0.7 \,\rm\mu m$. For silicon vacancy centres in thinner membranes down to $0.25\,\rm\mu m$, we observe spectral wandering, however, optical linewidths remain below $200\,\rm MHz$, which is compatible with spin-selective excitation schemes. Our work clearly shows that silicon vacancy centres can be integrated into sub-micron silicon carbide membranes, which opens the avenue towards obtaining the necessary improvements in photon extraction efficiency based on nanophotonic structuring.

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