标题： 应变驱动的六方氮化硼中自旋缺陷发射增强 显示英文标题

标题： Deformation-Driven Enhancement of Spin Defect Emission in Hexagonal Boron Nitride

摘要： 在六方氮化硼（hBN）中，带负电的硼空位（VB-）已被广泛研究，因为它为二维量子传感提供了一个新的平台，并且与目标样品具有最终的接近性。 然而，其实际灵敏度受到自旋集合固有的弱光致发光的限制。 在这里，我们报告了在悬浮区域的VB-中心的光致发光相比基底支撑区域增强了多达30倍。 该区域的VB-中心的关键自旋特性，如光学检测磁共振（ODMR）对比度和线宽，以及自旋寿命，得到了良好保持。 详细的调查，包括零场ODMR测量、拉曼光谱和开尔文探针力显微镜，揭示了发射增强与样品局部变形之间的相关性。 结论是，悬浮区域相比支撑区域表现出更高的局部变形，破坏了局部对称性，从而激活了VB-中心原本禁止或微弱的光学跃迁。 显示英文摘要

摘要： The negatively charged boron vacancy (VB-) in hexagonal boron nitride (hBN) has been extensively investigated as it offers a novel playground for two-dimensional quantum sensing, with ultimate proximity to target samples. However, its practical sensitivity is limited by the intrinsically weak photoluminescence of the spin ensemble. Here, we report a photoluminescence enhancement of up to 30 times from VB- centers in suspended regions of hBN compared to those in substrate-supported areas. The key spin properties, such as the optically detected magnetic resonance (ODMR) contrast and linewidth, as well as the spin lifetime, of the VB- centers in this region are well preserved. Detailed investigations, including measurements of zero-field ODMR, Raman spectroscopy, and Kelvin probe force microscopy, reveal a correlation between emission enhancement and local deformation in the sample. It is concluded that the suspended regions exhibit higher local deformation compared to the supported areas, breaking the local symmetry and thereby activating otherwise forbidden or weak optical transitions of the VB- centers.