Structural Attributes and Photodynamics of Visible Spectrum Quantum Emitters in Hexagonal Boron Nitride
Structural Attributes and Photodynamics of Visible Spectrum Quantum Emitters in Hexagonal Boron Nitride
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DOI：
10.1021/acs.nanolett.6b03268
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发表时间：
2016-11-01
期刊：
影响因子：
10.8
通讯作者：
Wrachtrup, Joerg
中科院分区：
文献类型：
--
作者：
Chejanovsky, Nathan;Rezai, Mohammad;Wrachtrup, Joerg
新发现的货车范德华材料，如MoS 2、WSe 2、六方氮化硼（h-BN）和最近的C2 N，引发了深入的研究，以揭示与其二维结构相关的量子行为。非常感兴趣的是承载单量子发射器的2D材料。具有5.95 eV带隙的h-BN已被证明具有在室温下在UV和可见光谱范围内稳定的单量子发射体。在本文中，我们调查hBN的结构特征和发射极的位置之间的相关性，从散装到单层在室温下。我们证明了化学蚀刻和离子辐照可以在h-BN中产生发射极。我们分析了这些发光体的光谱特征，发现它们的光谱特征主要是由它们的电子跃迁与h-BN的单个拉曼激活模的相互作用决定的。光动力学分析揭示了发射体的电子态之间的不同速率。即使在环境条件下和在单层中，发射体也显示出优异的光稳定性。比较不同发射体之间的激发极化揭示了缺陷取向与h-BN六方结构之间的联系。尖锐的光谱特征，颜色多样性，室温稳定性，长寿命的亚稳态，易于制造，发射器接近环境，出色的化学稳定性和hBN的生物相容性提供了一个全新的系统，可用于传感和量子光子学应用。
Newly discovered van der Waals materials like MoS2, WSe2, hexagonal boron nitride (h-BN), and recently C2N have sparked intensive research to unveil the quantum behavior associated with their 2D structure. Of great interest are 2D materials that host single quantum emitters. h-BN, with a band gap of 5.95 eV, has been shown to host single quantum emitters which are stable at room temperature in the UV and visible spectral range. In this paper we investigate correlations between hBN structural features and emitter location from bulk down to the monolayer at room temperature. We demonstrate that chemical etching and ion irradiation can generate emitters in h-BN. We analyze the emitters' spectral features and show that they are dominated by the interaction of their electronic transition with a single Raman active mode of h-BN. Photodynamics analysis reveals diverse rates between the electronic states of the emitter. The emitters show excellent photo stability even under ambient conditions and in monolayers. Comparing the excitation polarization between different emitters unveils a connection between defect orientation and the h-BN hexagonal structure. The sharp spectral features, color diversity, room-temperature stability, long-lived metastable states, ease of fabrication, proximity of the emitters to the environment, outstanding chemical stability, and biocompatibility of hBN provide a completely new class of systems that can be used for sensing and quantum photonics applications.