Regensburg 2025 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 30: Focus Session: Young Semiconductor Forum

HL 30.3: Invited Talk

Wednesday, March 19, 2025, 10:30–11:00, H13

Ultrafast quantum optics with single-photon emitters in 2D materials — •Steffen Michaelis de Vasconcellos — Physikalisches Intitut, Universität Münster, Germany

Single-photon sources are essential components for building quantum networks, though achieving optimal control remains a significant challenge in advancing quantum technologies. Recently, 2D van der Waals materials, such as transition metal dichalcogenides (TMDs) and hexagonal boron nitride (hBN), have emerged as promising platforms for solid-state quantum light emitters, enabling new possibilities for creating, tuning, and integrating quantum emitters into photonic devices [1].

In my talk, I will review the development of single-photon emitters in 2D materials, focussing particularly on the robust emitters in hBN, which efficiently emit single photons even at room temperature. We demonstrate the efficient collection of single-photons by 3D-printed microlenses [2] and explore ultrafast coherent control of individual hBN quantum emitters [3]. Understanding the underlying dephasing mechanisms is key to designing devices that meet the requirements for future quantum technologies. Our work paves the way towards controlled hybrid quantum systems integrating electronic and phononic excitations.

[1] S. Michaelis de Vasconcellos, et al., Single-Photon Emitters in Layered Van der Waals Materials, phys. status solidi (b) 259, 2100566 (2022) [2] J. A. Preuß, et al., Nano Lett. 23, 407 (2023) [3] J. A. Preuß, et al., Optica 9, 522 (2022)

Keywords: quantum optics; single-photon emitters; 2D materials; hBN; coherent control