Quantized exciton-exciton annihilation in monolayer on substrate with atomically flat terraces
Quantized exciton-exciton annihilation in monolayer on substrate with atomically flat terraces
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具有原子级平坦平台的衬底上单层的量子化激子-激子湮灭
DOI：
10.1103/physrevb.103.l241410
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发表时间：
2021
影响因子：
3.7
通讯作者：
and Yasuhiro Yamada
中科院分区：
文献类型：
--
作者：
Yuto Kajino;Kohei Sakanashi;Nobuyuki Aoki;Kenji Watanabe;Takashi Taniguchi;Kenichi Oto;and Yasuhiro Yamada
单层材料受到其电势波动的强烈影响，这可能是由衬底的固有电阻或表面粗糙度引起的。我们比较了不同表面形貌的单层衬底的有效激子-激子湮灭（EEA）速率常数。我们发现，themonolayers在衬底上的原子级平坦的梯田有小的有效EEA速率常数，偏离整体趋势，并表现出多个激子衰减组件，这是不能占传统的EEA模型。为了获得正确的描述，重要的是使用量化的EEA模型。本征EEA速率常数的平台基板由该模型确定的是可比的hBN封装的单层。
Monolayer materials are strongly affected by their potential fluctuations, which can be induced by an intrinsic corrugation or the surface roughness of the substrate. We compare the effective exciton-exciton annihilation (EEA) rate constants of monolayeron substrates with different surface topographies. We show that themonolayers on the substrates with atomically flat terraces have small effective EEA rate constants that deviate from the overall tendency and exhibit multiple exciton decay components, which cannot be accounted for by the conventional EEA model. To obtain a correct description, it is important to use a quantized EEA model. The intrinsic EEA rate constants for the flat-terrace substrates determined by this model are comparable to that of hBN-encapsulated monolayer.