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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 32: 2D Materials IV (joint session HL/CPP)

CPP 32.10: Talk

Wednesday, March 29, 2023, 12:15–12:30, POT 81

Optimized Irradiation Protocol for Quantum Sensors in Hexagonal Boron Nitride — •Paul Konrad¹, Andreas Gottscholl¹, Andreas Sperlich¹, Igor Aharonovich², and Vladimir Dyakonov¹ — ¹Experimental Physics 6, Julius-Maximilians-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 (V_B⁻) in hexagonal boron nitride (hBN)^[1] has shown that the defect exhibits 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.

Here we present an irradiation protocol for creation of V_B⁻ by nitrogen ions, leading to optimized spin relaxation parameters and therefore improving quantum metrology limits. We also present tremendous improvement of ODMR contrast showing hyperfine interaction 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).