Quantum 2025 – wissenschaftliches Programm
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TUE: Tuesday Contributed Sessions
TUE 11: Quantum Optics and Quantum Computation
TUE 11.8: Vortrag
Dienstag, 9. September 2025, 16:00–16:15, ZHG104
Probing MHz Charge Dynamics in Diamond Using 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 affected by electric noise originating from the diamond host material itself [1]. This noise arises from free charge carriers being intermittently trapped and released by defects (charge traps) in the diamond lattice, generating a fluctuating electric field that shifts the energy levels of the color centers. As a result, the optical transitions become unstable, posing challenges for applications that rely on consistent sources of indistinguishable photons. Despite their significance, the characteristics of these charge traps remain poorly understood. In this work, we present a method to probe the dynamics of individual charge processes in diamond with MHz temporal resolution, utilizing a tin-vacancy color center. Our measurements reveal that charge capture and release rates vary across two orders of magnitude, from Hz to kHz, suggesting the presence of two distinct mechanisms governing these processes. Additionally, we observe that illumination with 520 nm light more strongly affects the charge release rates than higher-energy 445 nm light. These results provide new insights into the nature of charge traps in diamond and the underlying dynamics of single-charge trapping and release.
[1] Pieplow, Torun et al., Quantum Electrometer for Time-resolved Material Science at the Atomic Lattice Scale, arXiv:2401.14290, 2024
Keywords: Diamond color center; In-situ sensing; Electrometry; Charge dynamics