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Spin-layer locking of interlayer excitons trapped in moiré potentials.
Nature Materials ( IF 41.2 ) Pub Date : 2020-05-25 , DOI: 10.1038/s41563-020-0687-7
Mauro Brotons-Gisbert 1 , Hyeonjun Baek 1 , Alejandro Molina-Sánchez 2, 3 , Aidan Campbell 1 , Eleanor Scerri 1 , Daniel White 1 , Kenji Watanabe 4 , Takashi Taniguchi 4 , Cristian Bonato 1 , Brian D Gerardot 1
Affiliation  

Van der Waals heterostructures offer attractive opportunities to design quantum materials. For instance, transition metal dichalcogenides (TMDs) possess three quantum degrees of freedom: spin, valley index and layer index. Furthermore, twisted TMD heterobilayers can form moiré patterns that modulate the electronic band structure according to the atomic registry, leading to spatial confinement of interlayer excitons (IXs). Here we report the observation of spin–layer locking of IXs trapped in moiré potentials formed in a heterostructure of bilayer 2H-MoSe2 and monolayer WSe2. The phenomenon of locked electron spin and layer index leads to two quantum-confined IX species with distinct spin–layer–valley configurations. Furthermore, we observe that the atomic registries of the moiré trapping sites in the three layers are intrinsically locked together due to the 2H-type stacking characteristic of bilayer TMDs. These results identify the layer index as a useful degree of freedom to engineer tunable few-level quantum systems in two-dimensional heterostructures.



中文翻译:

夹在莫尔电势中的层间激子的自旋层锁定。

Van der Waals异质结构为设计量子材料提供了诱人的机会。例如,过渡金属二硫化碳(TMD)具有三个量子自由度:自旋,谷值指数和层指数。此外,扭曲的TMD异质双分子层可以形成波纹图案,该图案根据原子登记仪调节电子能带结构,从而导致层间激子(IXs)的空间受限。在这里我们报告观察到的IXs的自旋层锁定,该IXs被困在双层2H-MoSe 2和单层WSe 2的异质结构中形成的莫尔电位中。电子自旋和层索引被锁定的现象导致两个量子限制的IX物种具有不同的自旋-层-谷构型。此外,我们观察到由于双层TMDs的2H型堆积特性,三层中的莫尔陷阱位点的原子登记本来就锁定在一起。这些结果将层索引确定为在二维异质结构中设计可调级几级量子系统的有用自由度。

更新日期:2020-05-25
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