Regensburg 2022 – wissenschaftliches Programm

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QI: Fachverband Quanteninformation

QI 4: Poster: Quantum Information

QI 4.41: Poster

Montag, 5. September 2022, 18:00–20:00, P2

Spin defects in hBN as promising temperature, pressure and magnetic field quantum sensor — •Paul Konrad1, Andreas Gottscholl1, Andreas Sperlich1, Igor Aharonovich2, and Vladimir Dyakonov11Experimental Physics 6, Julius Maximilian University of Würzburg, 97074 Würzburg — 2School of Mathematics and Physical Sciences, University of Technology Sydney, Ultimo, NSW 2007, Australia

Colour centres in solid-state materials show great potential in quantum information technology and sensing applications. The lately discovered negatively charged boron vacancy (VB) in hexagonal boron nitride (hBN)[1] has shown the defect to be host to a spin-triplet ground state with spin-dependent photoluminescence. The system can be exploited in terms of its application as temperature, magnetic field, and pressure sensor [2,3] which extends the already known applications of e.g. NV-centers in diamond not only due to its 2D character but also by highly improved temperature sensing especially at low temperatures.

Yet, the irradiation protocol is still unoptimized and achieving high contrast optically detected magnetic resonance (ODMR) on increasingly thinner flakes remains a challenge. We are on our way to tackle aforementioned challenges by performing measurements on VB created by various types of irradiation and achieve tremendous improvement of ODMR contrast on flakes of down to 80nm thickness.

[1] Gottscholl et al., Nat. Mat., 19, 5, 540 (2020).

[2] Gottscholl et al., Sci. Adv., 7 (14), eabf3630 (2021).

[3] Gottscholl et al., Nat. Commun., 12, 4480 (2021).

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