Nuclear Spin-Mediated Relaxation Mechanisms of the V$_{B}^-$ Center in hBN
Fuente:
arXiv
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866917096780201984 |
|---|---|
| author | Cholsuk, Chanaprom Vogl, Tobias Ivády, Viktor |
| author_facet | Cholsuk, Chanaprom Vogl, Tobias Ivády, Viktor |
| contents | The negatively charged boron vacancy $V_B^-$ defect in hexagonal boron nitride (hBN) has recently emerged as a promising spin qubit for sensing due to its high-temperature spin control and versatile integration into van der Waals structures. While extensive experiments have explored their coherence properties, much less is known about the spin relaxation time $T_1$ and its control-parameter dependence. In this work, we develop a parameter-free spin dynamics model based on the cluster-expansion technique to investigate $T_1$ relaxation mechanisms at low temperature. Our results reveal that the $V_B^-$ center constitutes a strongly coupled electron spin-nuclear spin core, which necessitates the inclusion of the coherent dynamics and derived memory effects of the three nearest-neighbor nitrogen nuclear spins. Using this framework, this work closely reproduces the experimentally observed $T_1$ time at $B = 90\,\mathrm{G}$ and further predicts the $T_1$ dependence on external magnetic field in the $0 \le B \le 2000\,\mathrm{G}$ interval, when the spin relaxation is predominantly driven by electron-nuclear and nuclear-nuclear flip-flop processes mediated by hyperfine and dipolar interactions. This study establishes a reliable and scalable approach for describing $T_1$ relaxation in $V_B^-$ centers and offers microscopic insights to support future developments in nuclear-spin-based quantum technologies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_11494 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Nuclear Spin-Mediated Relaxation Mechanisms of the V$_{B}^-$ Center in hBN Cholsuk, Chanaprom Vogl, Tobias Ivády, Viktor Quantum Physics Materials Science Computational Physics The negatively charged boron vacancy $V_B^-$ defect in hexagonal boron nitride (hBN) has recently emerged as a promising spin qubit for sensing due to its high-temperature spin control and versatile integration into van der Waals structures. While extensive experiments have explored their coherence properties, much less is known about the spin relaxation time $T_1$ and its control-parameter dependence. In this work, we develop a parameter-free spin dynamics model based on the cluster-expansion technique to investigate $T_1$ relaxation mechanisms at low temperature. Our results reveal that the $V_B^-$ center constitutes a strongly coupled electron spin-nuclear spin core, which necessitates the inclusion of the coherent dynamics and derived memory effects of the three nearest-neighbor nitrogen nuclear spins. Using this framework, this work closely reproduces the experimentally observed $T_1$ time at $B = 90\,\mathrm{G}$ and further predicts the $T_1$ dependence on external magnetic field in the $0 \le B \le 2000\,\mathrm{G}$ interval, when the spin relaxation is predominantly driven by electron-nuclear and nuclear-nuclear flip-flop processes mediated by hyperfine and dipolar interactions. This study establishes a reliable and scalable approach for describing $T_1$ relaxation in $V_B^-$ centers and offers microscopic insights to support future developments in nuclear-spin-based quantum technologies. |
| title | Nuclear Spin-Mediated Relaxation Mechanisms of the V$_{B}^-$ Center in hBN |
| topic | Quantum Physics Materials Science Computational Physics |
| url | https://arxiv.org/abs/2507.11494 |