Laser -在室温下具有可调圆偏振的图案化亚微米Bi2Se3-WS2像素
Laser-patterned submicron Bi2Se3-WS2 pixels with tunable circular polarization at room temperature
摘要：
表征和操纵光的圆偏振是众多新兴技术的核心，包括自旋电子学和量子计算。另外，单层二硫化钨（WS 2）是一种多功能材料，在各种应用中表现出了希望，包括单光子发射器和谷电子学。在这里，我们展示了一种方法来调整的光致发光（PL）强度（因子为x161），峰值位置（38.4meV范围），圆偏振（39.4%范围），和谷偏振的Bi 2Se 3-WS 2二维异质结使用低功率激光（0.762uW）在环境中。变化在空间上局限于激光光斑，实现亚微米（814 nm）特征，并且长期稳定（>334天）。PL和谷偏振变化可以通过真空中的激光曝光可控地逆转，允许材料被擦除和重复使用。大气实验和第一性原理计算表明氧扩散调节激子辐射与非辐射复合途径，其中氧吸收导致变亮，解吸导致变暗。
英文摘要：
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.
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