论文标题
激光图案的亚微米BI2SE3-WS2像素在室温下具有可调圆极化
Laser-patterned submicron Bi2Se3-WS2 pixels with tunable circular polarization at room temperature
论文作者
论文摘要
表征和操纵光的圆极化对于众多新兴技术（包括旋转型和量子计算）至关重要。另外，单层钨硫化物（WS2）是一种多才多艺的材料，在包括单个光子发射器和valleytronics在内的各种应用中都表现出了希望。在这里，我们演示了一种调整光致发光（PL）强度（X161的因子），峰位置（38.4MEV范围），圆极化（39.4％范围）和Valley在Ambient中使用低功率激光器（0.762UW）的BI2SE3-WS2 2D异质结构的峰值极化的方法。变化在空间上局限于激光斑点，可实现亚微米（814nm）的特征，并且长期稳定（> 334天）。 PL和山谷极化变化可以通过真空中的激光暴露来控制，从而可以删除和重复使用材料。大气实验和第一原理计算表明氧扩散调节激子辐射与非辐射重组途径，其中氧气吸收会导致亮度增强，并使脱附变黑。
Characterizing and manipulating the circular polarization of light is central to numerous emerging technologies, including spintronics and quantum computing. Separately, monolayer tungsten disulfide (WS2) is a versatile material that has demonstrated promise in a variety of applications, including single photon emitters and valleytronics. Here, we demonstrate a method to tune the photoluminescence (PL) intensity (factor of x161), peak position (38.4meV range), circular polarization (39.4% range), and valley polarization of a Bi2Se3-WS2 2D heterostructure using a low-power laser (0.762uW) in ambient. Changes are spatially confined to the laser spot, enabling submicron (814nm) features, and are long-term stable (>334 days). PL and valley polarization changes can be controllably reversed through laser exposure in vacuum, allowing the material to be erased and reused. Atmospheric experiments and first-principles calculations indicate oxygen diffusion modulates the exciton radiative vs. non-radiative recombination pathways, where oxygen absorption leads to brightening, and desorption to darkening.
