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  • Letter
  • Open Access

Spin coherence in strongly coupled spin baths in quasi-two-dimensional layers

Philip Schätzle1,2, Reyhaneh Ghassemizadeh3, Daniel F. Urban3, Thomas Wellens1, Peter Knittel1, Florentin Reiter1, Jan Jeske1, and Walter Hahn1,*

  • *Contact author: walter.hahn@iaf.fraunhofer.de

Phys. Rev. B 110, L220302 – Published 9 December, 2024

DOI: https://doi.org/10.1103/PhysRevB.110.L220302

Abstract

We investigate the spin-coherence decay of NV− spins interacting with the strongly coupled bath of nitrogen defects in diamond layers. For thin diamond layers, we demonstrate that the spin-coherence times exceed those of bulk diamond, thus allowing to surpass the limit imposed by high-defect concentrations in bulk. We show that the stretched-exponential parameter for the short-time spin-coherence decay is governed by the hyperfine interaction in the bath, thereby constraining random-noise models. We introduce a method based on the cluster-correlation expansion applied to strongly interacting bath partitions instead of individual spins. Our results facilitate material development for quantum-technology devices.

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