arXiv 2602.106902026-02-11quant-phcond-mat.mtrl-sci

金刚石中中性硅空位中心在极端各向同性应变场下的磁光性质

Magneto-optical properties of the neutral silicon-vacancy center in diamond under extreme isotropic strain fields

Wigner Research Centre for Physics（维格纳物理研究中心）；Eötvös Loránd University（罗兰大学）；Budapest University of Technology and Economics, Institute of Physics, Department of Atomics Physics（布达佩斯技术与经济大学物理学院原子物理系）

Meysam Mohseni, Gergő Thiering, Adam Gali

备注：: 10 pages, 5 figures, 3 tables

阅读 PDF

arXiv 页面 ↗HTML 原文 ↗

AI总结：

研究了金刚石中性硅空位中心在极端各向同性应变下的磁光性质，发现其自旋轨道分裂和振动能隙变化，表明其作为对称性保护的应变可调量子发射体的潜力。

摘要：

金刚石中的中性硅-空位（SiV⁰）中心结合了反演对称性和光学发射，使其成为一种稳健的量子发射体，能够抵御杂散电场的影响。利用第一性原理的密度泛函理论，我们量化了其对各向同性应变的响应，涵盖了强压缩和拉伸区域（有效等效压强约为-80到180 GPa）。双重简并的eg和eu能级共存，产生了一种由二次积简正模型捕捉的结构不稳定性。在各向同性压缩下，零声子线几乎线性地蓝移，而Eg声子变硬，抑制了振动能级的不稳定性并减少了简正淬灭。因此，哈姆-缩减的激发态自旋轨道分裂显著增加，暗-亮振动能隙变宽。相反，各向同性拉伸应变增强了振动能级效应，并在临界应变后诱导了对称性破坏，其中在临界点处出现了由隧道介导的动态平均。在整个对称性保持区域内，对称性保持良好，因此各向同性应变本身不会激活暗跃迁。电荷跃迁能级表明，在压缩区域深处发射的光稳定性，而在最高光稳定性变形（约100 GPa）附近，由于过渡偶极矩的减少，辐射寿命增加，尽管光学能量在增加。这些趋势产生了紧凑的校准关系，将光学和自旋可观察性与各向同性应变联系起来，并确立SiV⁰作为对称性保护、应变可调的量子发射体，能够在多兆巴等价范围内运行。

英文摘要：

The neutral silicon--vacancy (SiV$^{0}$) center in diamond combines inversion symmetry with optical emission, making it a robust quantum emitter resilient to stray electric fields. Using first-principles density-functional theory, we quantify its response to isotropic strain spanning strong compression and tensile regimes (effective hydrostatic pressures of approximately $-80$ to $180$~GPa). The coexistence of doubly degenerate $e_g$ and $e_u$ levels produces a structural instability captured by a quadratic product Jahn--Teller model. Under isotropic compression, the zero-phonon line blue-shifts nearly linearly while the $E_g$ phonon stiffens, suppressing vibronic instabilities and reducing Jahn--Teller quenching. Consequently, the Ham-reduced excited-state spin--orbit splitting increases substantially and the dark--bright vibronic gap widens. In contrast, isotropic tensile strain enhances vibronic effects and induces symmetry breaking beyond a critical strain, with tunneling-mediated dynamical averaging at the onset. Throughout the symmetry-preserving regime, parity remains well defined, so isotropic strain alone does not activate the dark transition. Charge-transition levels indicate photostability of the emission deep into the compressive regime, and near the highest photostable deformation ($\sim 100$~GPa), the radiative lifetime increases due to a reduced transition dipole moment despite the increasing optical energy. These trends yield compact calibration relations linking optical and spin observables to isotropic strain and establish SiV$^{0}$ as a symmetry-protected, strain-tunable quantum emitter operating into the multi-megabar-equivalent regime.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

AI总结：

摘要：

英文摘要：

相关论文