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Optical probing of phononic properties of a tin-vacancy color center in diamond

Cem Güney Torun1,*, Joseph H. D. Munns1,*, Franziska Marie Herrmann1, Viviana Villafane2,3, Kai Müller3, Ulrich Kentsch4, Shavkat Akhmadaliev4, Anthony C. Withers5, Andreas Thies6 et al.

Wentao Zhang6, Aleksei Tsarapkin6, Katja Höflich6, Tommaso Pregnolato1,6, Gregor Pieplow1, and Tim Schröder1,6,†

  • *These authors contributed equally to this work.
  • †Contact author: tim.schroeder@physik.hu-berlin.de

Phys. Rev. Research 8, 023230 – Published 1 June, 2026

DOI: https://doi.org/10.1103/swkr-r6mb

Abstract

The coherence characteristics of a tin-vacancy (SnV) color center in diamond are investigated through optical means, including linewidth broadening effects and coherent population trapping (CPT) between the ground-state orbital levels. Spectral analysis is required as due to the large spin-orbit splitting of the orbital ground states, thermalization between the ground states occurs at rates that are impractical to measure directly in the time domain. First, by implementing a temperature-dependent linewidth broadening measurement, including the challenging-to-measure D transition, phononic coupling coefficients are determined. These measurements are performed on an emitter with a lifetime-limited linewidth and atomlike properties, making the measurement representative for high-quality SnVs. Next, a CPT-type experiment is carried out to independently analyze thermal decoherence processes at 4 K. The spectral information is transformed into its conjugate variable time, providing picosecond resolution and revealing an orbital depolarization timescale of ∼30ps. Consequences of the investigated dynamics are then used to estimate spin dephasing times limited by thermal effects.

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