Spin-dependent photodynamics of boron-vacancy centers in hexagonal boron nitride
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2024
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| author | Clua-Provost, T. Mu, Z. Durand, A. Schrader, C. Happacher, J. Bocquel, J. Maletinsky, P. Fraunié, J. Marie, X. Robert, C. Seine, G. Janzen, E. Edgar, J. H. Gil, B. Cassabois, G. Jacques, V. |
| author_facet | Clua-Provost, T. Mu, Z. Durand, A. Schrader, C. Happacher, J. Bocquel, J. Maletinsky, P. Fraunié, J. Marie, X. Robert, C. Seine, G. Janzen, E. Edgar, J. H. Gil, B. Cassabois, G. Jacques, V. |
| contents | The negatively-charged boron vacancy (V$_\text{B}^-$) center in hexagonal boron nitride (hBN) is currently garnering considerable attention for the design of two-dimensional (2D) quantum sensing units. Such developments require a precise understanding of the spin-dependent optical response of V$_\text{B}^-$ centers, which still remains poorly documented despite its key role for sensing applications. Here we investigate the spin-dependent photodynamics of V$_\text{B}^-$ centers in hBN by a series of time-resolved photoluminescence (PL) measurements. We first introduce a robust all-optical method to infer the spin-dependent lifetime of the excited states and the electron spin polarization of V$_\text{B}^-$ centers under optical pumping. Using these results, we then analyze PL time traces recorded at different optical excitation powers with a seven-level model of the V$_\text{B}^-$ center and we extract all the rates involved in the spin-dependent optical cycles, both under ambient conditions and at liquid helium temperature. These findings are finally used to study the impact of a vector magnetic field on the optical response. More precisely, we analyze PL quenching effects resulting from electron spin mixing induced by the magnetic field component perpendicular to the V$_\text{B}^-$ quantization axis. All experimental results are well reproduced by the seven-level model, illustrating its robustness to describe the spin-dependent photodymanics of V$_\text{B}^-$ centers. This work provides important insights into the properties of V$_\text{B}^-$ centers in hBN, which are valuable for future developments of 2D quantum sensing units. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_14155 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Spin-dependent photodynamics of boron-vacancy centers in hexagonal boron nitride Clua-Provost, T. Mu, Z. Durand, A. Schrader, C. Happacher, J. Bocquel, J. Maletinsky, P. Fraunié, J. Marie, X. Robert, C. Seine, G. Janzen, E. Edgar, J. H. Gil, B. Cassabois, G. Jacques, V. Materials Science The negatively-charged boron vacancy (V$_\text{B}^-$) center in hexagonal boron nitride (hBN) is currently garnering considerable attention for the design of two-dimensional (2D) quantum sensing units. Such developments require a precise understanding of the spin-dependent optical response of V$_\text{B}^-$ centers, which still remains poorly documented despite its key role for sensing applications. Here we investigate the spin-dependent photodynamics of V$_\text{B}^-$ centers in hBN by a series of time-resolved photoluminescence (PL) measurements. We first introduce a robust all-optical method to infer the spin-dependent lifetime of the excited states and the electron spin polarization of V$_\text{B}^-$ centers under optical pumping. Using these results, we then analyze PL time traces recorded at different optical excitation powers with a seven-level model of the V$_\text{B}^-$ center and we extract all the rates involved in the spin-dependent optical cycles, both under ambient conditions and at liquid helium temperature. These findings are finally used to study the impact of a vector magnetic field on the optical response. More precisely, we analyze PL quenching effects resulting from electron spin mixing induced by the magnetic field component perpendicular to the V$_\text{B}^-$ quantization axis. All experimental results are well reproduced by the seven-level model, illustrating its robustness to describe the spin-dependent photodymanics of V$_\text{B}^-$ centers. This work provides important insights into the properties of V$_\text{B}^-$ centers in hBN, which are valuable for future developments of 2D quantum sensing units. |
| title | Spin-dependent photodynamics of boron-vacancy centers in hexagonal boron nitride |
| topic | Materials Science |
| url | https://arxiv.org/abs/2404.14155 |