通过声子辅助激发实现双层WSe₂中的高纯度稳定单光子发射
High-purity and stable single-photon emission in bilayer WSe$_2$ via phonon-assisted excitation
AI总结：
该研究针对双层WSe₂量子发射体，对比不同激发方案的效果，证实声子辅助激发可显著降低光谱扩散、提升单光子纯度、缩短衰减时间，为高性能单光子源开发提供支撑。
摘要：
激发方案对单光子源至关重要，它决定了激子制备、衰减动力学以及发射光子的光谱扩散特性。尽管声子辅助激发已在其他量子发射体平台展现出应用潜力，但在过渡金属二硫化物（TMD）量子发射体中，其合理实现方案以及与其他替代激发方案的系统性对比尚未得到验证。本研究探究了不同光学激发策略对双层WSe₂量子发射体单光子发射特性的影响。基于我们对激子制备保真度的理论预测，我们将纵声学声子模式、呼吸声子模式辅助激发与传统的带边以上激发、近共振激发进行了对比。在声学声子辅助激发下，我们实现了窄线宽单光子发射，其光谱扩散降低至0.0129 nm，相比带边以上激发提升了1.8倍。此外，呼吸声子模式激发实现了0.947±0.079的高单光子纯度，并将衰减时间降低了一个数量级以上，达到(1.33±0.04) ns。我们的全面研究证明了声子辅助激发在优化WSe₂基量子发射体性能方面的关键作用，为面向量子光子学应用的单光子源开发提供了宝贵参考。
英文摘要：
The excitation scheme is essential for single-photon sources, as it governs exciton preparation, decay dynamics, and the spectral diffusion of emitted photons. While phonon-assisted excitation has shown promise in other quantum emitter platforms, its proper implementation and systematic comparison with alternative excitation schemes have not yet been demonstrated in transition metal dichalcogenide (TMD) quantum emitters. Here, we investigate the impact of various optical excitation strategies on the single-photon emission properties of bilayer WSe$_2$ quantum emitters. Based on our theoretical predictions for the exciton preparation fidelity, we compare excitation via the longitudinal acoustic and breathing phonon modes to conventional above-band and near-resonance excitations. Under acoustic phonon-assisted excitation, we achieve narrow single-photon emission with a reduced spectral diffusion of 0.0129 nm, a 1.8-fold improvement over above-band excitation. Additionally, excitation through breathing-phonon mode yields a high purity of $ 0.947\pm 0.079\,$ and reduces the decay time by over an order of magnitude, reaching $(1.33 \pm 0.04)\,$ns. Our comprehensive study demonstrates the crucial role of phonon-assisted excitation in optimizing the performance of WSe$_2$-based quantum emitters, providing valuable insights for the development of single-photon sources for quantum photonics applications.
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