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Q: Fachverband Quantenoptik und Photonik
Q 68: Quantum Technologies (Color Centers and Ion Traps) II (joint session Q/QI)
Q 68.2: Vortrag
Freitag, 14. März 2025, 11:30–11:45, HS Botanik
Measuring MHz charge dynamics in diamond with a tin-vacancy color center — •Charlotta Gurr1, Cem Güney Torun1, Gregor Pieplow1, and Tim Schröder1,2 — 1Humboldt-Universität zu Berlin, Germany — 2Ferdinand-Braun-Institut gGmbH, Leibniz-Institut für Höchstfrequenztechnik, Berlin, Germany
Color centers in diamond are influenced by electric noise from their diamond host material [1]. Free charge carriers being trapped and released from charge traps in the diamond lattice create a fluctuating electric field environment, shifting the color center’s energy levels. The optical transitions are therefore rendered unstable, to the detriment of applications that require a source of indistinguishable photons. Little is known about the nature of the charge traps. Here, we develop a technique to investigate the charge process dynamics of single charges in diamond with MHz resolution, using a tin-vacancy color center. We find charge capture and release rates spanning two orders of magnitude within Hz and kHz, possibly revealing two different effects influencing the charge processes. Furthermore, we find that 520 nm illumination of the diamond sample influences the charge release rates more strongly than more energetic 445 nm illumination. We believe this to be caused by a two-step process leading to the release of charges from charge traps. These findings expand our understanding of charge traps in diamond as well as the processes responsible for capturing and releasing single charges.
[1] Pieplow, Torun et al., Quantum Electrometer for Time-resolved Material Science at the Atomic Lattice Scale, arXiv:2401.14290, 2024
Keywords: Charge dynamics; Diamond color centers; Tin-vacancy center; Electric field sensor