Freiburg 2024 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 47: Open Quantum Systems
Q 47.6: Vortrag
Donnerstag, 14. März 2024, 12:15–12:30, HS 3219
Spin Coherence in Strongly-Coupled Spin Baths in Quasi Two-Dimensional Layers — Philip Schätzle1,2 and •Walter Hahn1 — 1Fraunhofer Institute for Applied Solid State Physics IAF, Tullastr. 72, 79108 Freiburg, Germany — 2Department of Sustainable Systems Engineering (INATECH), University of Freiburg, Emmy-Noether-Str. 2, 79110 Freiburg, Germany
We investigate the spin-coherence decay of NV−-spins interacting with the strongly-coupled disordered bath of the substitutional nitrogen defects in diamond layers. We show that the short-time decay follows a stretched-exponential function with a dimensionality-dependent stretched-exponential parameter that challenges analytical predictions. We find that this discrepancy is caused by the hyperfine interaction which strongly modifies the bath dynamics. We use a novel method based on the correlated-cluster expansion applied to partitions of the bath, which includes important high-order spin correlations. The results pave the way for enhanced materials for quantum-technology devices.
Keywords: strongly-correlated spin bath; NV spins; correlated-cluster expansion; spin coherence; stretched-exponential function