Sergei Nedić, Karin Yamamura, Angus Gale, Igor Aharonovich, Milos Toth
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引用次数: 0
摘要
六方氮化硼(hBN)有望成为用于片上量子光子学的固态范德华单光子发射器。在 436 纳米波长下发射的 B 中心缺陷尤其引人注目,因为它可以通过电子束照射产生。然而,发射器的产生机制尚不清楚,该方法的稳定性也不稳定,而且只成功应用于厚片 hBN(≫ 10 nm)。在此,我们使用原位时间分辨阴极发光 (CL) 光谱法来研究 B 中心的生成动力学。结果表明,B-中心的生成伴随着≈305 nm处碳相关发射的淬灭,而这两个过程的速率都受限于 hBN 晶格中缺陷的电迁移。该研究发现了限制发射体生成方法的有效性和可重复性的问题,并通过优化电子束参数和氢化硼预处理和后处理相结合的方法解决了这些问题。它在薄至 8 纳米的氢化硼薄片中实现了 B 中心量子发射器,阐明了电子束在氢化硼中重组量子发射器的机制,并获得了确定 B 中心量子发射器原子结构的见解。
Electron Beam Restructuring of Quantum Emitters in Hexagonal Boron Nitride
Hexagonal boron nitride (hBN) holds promise as a solid state, van der Waals host of single photon emitters for on-chip quantum photonics. The B-center defect emitting at 436 nm is particularly compelling as it can be generated by electron beam irradiation. However, the emitter generation mechanism is unknown, the robustness of the method is variable, and it has only been applied successfully to thick flakes of hBN (≫ 10 nm). Here, it is used in situ time-resolved cathodoluminescence (CL) spectroscopy to investigate the kinetics of B-center generation. It is shown that the generation of B-centers is accompanied by quenching of a carbon-related emission at ≈305 nm and that both processes are rate-limited by electromigration of defects in the hBN lattice. It identifies problems that limit the efficacy and reproducibility of the emitter generation method and solve them using a combination of optimized electron beam parameters and hBN pre-and postprocessing treatments. It is achieved B-center quantum emitters in hBN flakes as thin as 8 nm, elucidate the mechanisms responsible for electron beam restructuring of quantum emitters in hBN, and gain insights toward the identification of the atomic structure of the B-center quantum emitter.
期刊介绍:
Advanced Optical Materials, part of the esteemed Advanced portfolio, is a unique materials science journal concentrating on all facets of light-matter interactions. For over a decade, it has been the preferred optical materials journal for significant discoveries in photonics, plasmonics, metamaterials, and more. The Advanced portfolio from Wiley is a collection of globally respected, high-impact journals that disseminate the best science from established and emerging researchers, aiding them in fulfilling their mission and amplifying the reach of their scientific discoveries.