Freiburg 2024 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 56: Poster VII
Q 56.42: Poster
Donnerstag, 14. März 2024, 17:00–19:00, KG I Foyer
Low-noise magnetic sensing with tin-vacancy centers — •Gesa Welker1, Yufan Li1, Toeno van der Sar1, and Richard Norte2 — 1Faculty of Applied Sciences, TU Delft, The Netherlands — 2Faculty of 3mE, TU Delft, The Netherlands
Similar to the well-known nitrogen-vacancies (NV), tin-vacancy (SnV) defects in diamond have optically active spins. One of their most intriguing properties is their resilience to electrical noise, which is four orders of magnitude higher than for NV centers [1]. SnV centers are therefore expected to be formidable magnetic field sensors that outperform NV-based sensors at cryogenic temperatures. To the best of our knowledge, SnV centers have not been used for sensing since their experimental realization in 2017 [2,3]. We develop a fiber-coupled scanning-SnV-magnetometry setup, based on earlier work in our group with fiber-coupled NV centers [4]. We attach a diamond nanobeam with SnV centers to a tapered optical fiber, which we then scan across a sample. Fiber coupling increases sensitivity via a high optical excitation and collection efficiency. It allows using low laser power, thereby bringing millikelvin magnetometry into reach. Furthermore, fiber coupling eliminates the need for realignment of free-space optics when cooling to cryogenic temperatures. Our goal is achieving a sensitivity high enough to study weak magnetic signatures in condensed matter systems, e.g. 2D materials or correlated electron systems. [1] De Santis et al., PRL 127, 147402 (2021) [2] Iwasaki et al., PRL 119, 253601 (2017) [3] Ditalia Tchernij et al., ACS Photonics 4, 2580-2586 (2017) [4] Li et al., ACS Photonics 10, 1859-1865 (2023)
Keywords: Quantum Sensing; SnV centers in diamond; NV centers in diamond; Magnetometry