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SYQS: Symposium Quantum Sensing and Decoherence in Solid-State and Photonics Systems

SYQS 1: Quantum Sensing and Decoherence in Solid-State and Photonics Systems

SYQS 1.3: Hauptvortrag

Montag, 8. September 2025, 11:45–12:15, ZHG105

Towards spin-based quantum sensing in hybrid nanomechanical systems based on silicon carbide — •Eva Weig — Technical University of Munich, Germany

Silicon carbide (SiC) has extraordinary material properties, combining some of the most favorable properties of diamond and silicon. It hosts spin-carrying color centers and exhibits high mechanical quality factors. It is thus ideally suited for the realization of advanced hybrid nano-mechanical devices incorporating atomic-scale defects. In addition, SiC crystalizes in a variety of polytypes which entails different routes towards realizing high Q mechanical resonators. Cubic 3C-SiC enables thin-film epitaxial growth on silicon. Strong tensile pre-stress is incorporated when grown on a silicon substrate oriented along the (111) direction, leading to high Q from dissipation dilution. On the other hand, hexagonal 4H-SiC is a well-established material in nanophotonics and known for its highly coherent color centers. Recently, high intrinsic Q factors exceeding 100,000 have been demonstrated in monolithic 4H-SiC. Here I will compare nanomechanical resonators made of both 3C-SiC and 4H-SiC and describe the realization of optomechanical crystals. I will discuss how to generate color centers by means of He-ion implantation, and outline the prospects of both materials for spin-mechanical and spin-optomechanical sensing.

Keywords: Nanomechanics; Cavity optomechanics; Spin mechanics; Color centers; High Q resonators