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HL: Fachverband Halbleiterphysik

HL 26: 2D Materials and Heterostructures: Quantum Emitters and Defects

HL 26.1: Talk

Wednesday, March 20, 2024, 09:30–09:45, EW 201

Spin Dynamics of Quantum Sensors Based on Hexagonal Boron Nitride — •Paul Konrad¹, Andreas Sperlich¹, Igor Aharonovich², and Vladimir Dyakonov¹ — ¹Experimental Physics 6, Julius-Maximilians-University 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 new insights into the spin dynamics of V_B⁻ in form of measurements of ground-state repopulation after pulsed laser excitation. For these studies we record transient photoluminescence with sub-nanosecond accuracy and determine the influence of the relaxation dynamics on the coherent control of the quantum system. This information can be used to optimize pulse timing.

[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).

Keywords: time-resolved single-photon counting; negatively charged boron vacancy; quantum sensors; hexagonal boron nitride; 2D