论文标题
在SRTIO3底物上单层WS2中量化的激子 - 外激体歼灭，具有原子平坦的梯田
Quantized exciton-exciton annihilation in monolayer WS2 on SrTiO3 substrates with atomically flat terraces
论文作者
论文摘要
单层材料受其潜在波动的强烈影响，这些波动是由固有的波纹或基板的表面粗糙度引起的。我们比较了具有不同表面地形的底物上单层WS2的有效激子灭绝（EEA）速率常数。我们表明，具有原子平坦梯田的基材上的单层WS2显示出与整体趋势和多个激子衰减成分偏离的小有效EEA速率，而常规EEA模型无法解释这一点。为了获得正确的描述，我们使用量化的EEA模型。由该新模型确定的平面底物的固有EEA速率常数与HBN已封装的单层WS2相当。
Monolayer materials are strongly affected by their potential fluctuations, which are induced by an intrinsic corrugation or the surface roughness of the substrate. We compare the effective exciton-exciton annihilation (EEA) rate constants of monolayer WS2 on substrates with different surface topographies. We show that monolayer WS2 on the substrate with atomically flat terraces displays small effective EEA rate constant deviating from the overall tendency and multiple exciton decay components, which cannot be accounted for by a conventional EEA model. To obtain a correct description, we use a quantized EEA model. The intrinsic EEA rate constant for the flat-terrace substrates determined by this new model is comparable to that of hBN-encapsulated monolayer WS2.
