云纹势在范德华异质结层间激子准凝聚中的关键作用
Key role of the moire potential for the quasi-condensation of interlayer excitons in van der Waals heterostructures
摘要：
限制在过渡金属二硫属化物（TMD）双层异质结构中的层间激子为实现二维偶极超流体提供了一条很有前途的途径。在这里，我们研究实现这种集体状态所必需的实验条件。特别是，我们表明，固有的波纹势TMD双层产生的激子有效质量的指数增加。为了在相当大的温度下实现激子超流性，则有必要在限制电子和空穴的单层之间插入高$κ$电介质。因此，莫尔晶格深度对于超流相来说足够弱，从而理论上在低于约10 K的临界温度下出现。重要的是，对于现实的实验参数，层间激子准凝聚在具有有限动量的状态下，使得超流体是光学惰性的并且自发地流动。
英文摘要：
Interlayer excitons confined in bilayer heterostructures of transition metal dichalcogenides (TMDs) offer a promising route to implement two-dimensional dipolar superfluids. Here, we study the experimental conditions necessary for the realisation of such collective state. Particularly, we show that the moire potential inherent to TMD bilayers yields an exponential increase of the excitons effective mass. To allow for exciton superfluidity at sizeable temperatures it is then necessary to intercalate a high-$κ$ dielectric between the monolayers confining electrons and holes. Thus the moire lattice depth is sufficiently weak for a superfluid phase to theoretically emerge below a critical temperature of around 10 K. Importantly, for realistic experimental parameters interlayer excitons quasi-condense in a state with finite momentum, so that the superfluid is optically inactive and flows spontaneously.
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