Theory of spin-orbit-phonon processes governing the anisotropic spin relaxation of SiV and other G4V centers in diamond

ORAL

Abstract

Anisotropy in spin relaxation times T₁, T₂ has previously been observed [1] in the neutral silicon-vacancy center (SiV⁰) of diamond. Here, we report similar strongly anisotropic behavior on negatively charged silicon SiV⁻. In conjunction with experimental work we develop the key elements of orbital and spin flipping processes induced by thermal phonons. We find that group theory considerations and selection rules are crucial to understand the observed anisotropy and thus we were able to distinguish the strength of pure orbital-phonon relaxation [2,3] and various other weaker diagonal and off-axis spin-orbit-phonon terms.

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In summary, in the present talk I will show excellent agreement with our experiments and depict a general theory that can be extended to other G4V (group-IV-vacancy) defect qubits straightforwardly that may highlight the limitations and caveats of their current quantum technology applications.

[1] B. C. Rose, G. Thiering, ... N. P. de Leon, Phys. Rev. B 98, 235140 (2018)

[2] K. D. Jahnke et. al. New J. Phys. 17 043011 (2015)

[3] I. B. W. Harris and D. Englund, Phys. Rev. B 109, 085414 (2024)

*G. T. was supported by the János Bolyai Research Scholarship. This work was supported by the Hungarian (NKFIH) Office for Quantum Information National Laboratory of Hungary (grant no. 2022-2.1.1-NL-2022-00004) and by the German Federal Ministry of Research (BMBF) by DE-Brill (No. 13N16207), SPINNING (No. 13N16210 and No. 13N16215), CoGeQ (13N16101), quNV2.0 (13N16707) Quamapolis (No. 13N15375), and EXTRASENS (No. 731473 and 101017733) DLR via project QUASIMODO (No. 50WM2170), QuantumHiFi (16KIS1593), Deutsche (DFG) via Projects No. 386028944, No. 445243414, No. 491245864, and No. 387073854 and Competence Centre Quantum Computing BW (QC-4-BW). This project has also received funding from the EU's HORIZON program via QuMicro (No. 101046911), SPINUS (No. 101135699), C-QuENS (No. 101135359), QCIRCLE (No. 101059999) and FLORIN (No. 101086142), QuantERA II Sensextreme project (NKFIH grant no. 2019-2.1.7-ERA-NET-2022-00040), European Research Council via Synergy grant HyperQ (No. 856432), Utrasens-Vir (No. P2022-06-007) and QPhoton.

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Publication: Anisotropic relaxation for the negatively charged silicon vacancy center in diamond - planned, in preparation

Presenters

  • Gergo Thiering

    • HUN-REN Wigner Research Centre

Authors

  • Gergo Thiering

    • HUN-REN Wigner Research Centre

  • Adam Gali

    • Wigner Research Centre for Physics
    • HUN-REN Wigner Research Centre for Physics

  • Fedor Jelezko

    • Ulm University
    • Institute for Quantum Optics, Ulm University

  • Katharina Senkalla

    • Ulm University

  • Florian Frank

    • Ulm University

  • Berndt Koslowski

    • Ulm University