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arXiv 2602.02256cond-mat.mtrl-sciphysics.opticsquant-ph
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增强能量传输的hBN-PbI2异质结构中VB缺陷的发光与量子传感

Energy-Transfer-Enhanced Emission and Quantum Sensing of VB- Defects in hBN-PbI2 Heterostructures

École Polytechnique Fédérale de Lausanne (EPFL)(洛桑联邦理工学院)

Eveline Mayner, Yaroslav Zhumagulov, Cristian de Giorgio, Feihong Chu, Prabhu Swain, Georg Fantner, Andras Kis, Oleg Yazyev, Aleksandra Radenovic

AI总结:

通过异质结构增强VB-缺陷的发光与量子传感,利用PbI2敏化层提升PL强度并实现高灵敏度磁共振检测

摘要:

二维材料中的自旋缺陷在量子信息技术和传感应用中具有重要潜力。负电荷的硼空位(VB-)在六方氮化硼(hBN)中因其对温度、磁场和压力的敏感性而受到广泛关注。然而,其应用迄今为止受到固有微弱的光致发光(PL)的限制。通过制造一个带有敏化供体层的范德瓦尔异质结构,即碘化铅(PbI2),我们有效地将VB-的PL强度提高了5-45倍,同时保持与其他异质结构和vdW光电子平台的兼容性。异质结中的I型带对齐使激子迁移高效并抑制反向电子转移,而PbI2发射与缺陷吸收之间的强光谱重叠支持高效的荧光共振能量转移。从头计算的密度泛函理论(DFT)预测了一种光子齿轮机制,该机制通过最小的杂化来增强吸收和发射,同时保持磁共振(ODMR)对比度。实验上,该异质结构表现出增强的连续波ODMR灵敏度,并作为精确的外部磁场探测器。这项工作为放大纳米材料中微弱缺陷信号提供了概念验证,突显了一种新的策略,用于工程其光学和磁响应。

英文摘要:

Spin defects in two-dimensional materials hold significant potential for quantum information technologies and sensing applications. The negatively charged boron vacancy (VB-) in hexagonal boron nitride (hBN) has attracted considerable attention as a quantum sensor due to its demonstrated sensitivity to temperature, magnetic fields, and pressure.1 However, its applications have thus far been limited by inherently dim photoluminescence (PL). By fabricating a van der Waals heterostructure with a sensitizing donor layer, lead iodide (PbI2), we effectively enhance the PL intensity from the VB- by 5-45x, while maintaining compatibility with other heterostructures and vdW optoelectronic platforms. The type-I band alignment at the heterojunction enables efficient exciton migration while suppressing back-electron transfer, and the strong spectral overlap between the PbI2 emission and defect absorption supports efficient fluorescence resonance energy transfer. Ab initio density functional theory (DFT) predicts a photon-ratcheting mechanism that boosts absorption and emission while maintaining magnetic resonance (ODMR) contrast through minimal hybridization. Experimentally, the heterostructure exhibits enhanced continuous-wave ODMR sensitivity and functions as a precise probe of external magnetic fields. This work establishes a proof-of-concept for amplifying weak defect signals in nanomaterials, highlighting a new strategy for engineering their optical and magnetic responses.

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。

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