Regensburg 2022 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 30: Poster 2
HL 30.48: Poster
Donnerstag, 8. September 2022, 11:00–13:00, P3
Resonant and phonon-assisted ultrafast coherent control of a single hBN color center — •Daniel Groll1, Johann A. Preuß2, Robert Schmidt2, Thilo Hahn1, Paweł Machnikowski3, Rudolf Bratschitsch2, Tilmann Kuhn1, Steffen Michaelis de Vasconcellos2, and Daniel Wigger3,4 — 1Institute of Solid State Theory, University of Münster, Germany — 2Institute of Physics, University of Münster, Germany — 3Department of Theoretical Physics, Wrocław University of Science and Technology, Poland — 4School of Physics, Trinity College Dublin, Ireland
For the development of scalable quantum technologies, reliable single-photon emitters in solid state systems are required. In this context, promising candidates are the recently discovered color centers in the van der Waals insulator hBN. These single photon emitters are attracting increasing attention due to their quantum performance at room temperature and wide range of transition energies. Here we report on our recent results on the ultrafast optical coherent state manipulation of a single hBN color center [1]. By combining experiment and theory we achieve a sound understanding of the impact of environment noise and the coupling to phonons on the emitter’s coherence. Specifically, we detect the decoherence of optical phonon-assisted transitions, stemming in part from the finite lifetime of these phonons. The creation of acoustic phonons manifests in a rapid decrease of the emitter coherence during their emission and can lead to an ultrafast beat of the coherent control signal.
[1] J. Preuss, D. Groll, et al., Optica 9, 522-531 (2022)