论文标题
Moire在Van der Waals异质结构中层中激子的准敏度的关键作用
Key role of the moire potential for the quasi-condensation of interlayer excitons in van der Waals heterostructures
论文作者
论文摘要
限制在过渡金属二分法元素（TMDS）双层异质结构中的层间激子提供了实施二维偶极超级流体的有前途的途径。在这里，我们研究了实现这种集体状态所需的实验条件。尤其是，我们表明，TMD双层固有的Moire潜力产生了激子有效质量的指数增加。为了在较高的温度下允许激子超流量，然后有必要在限制电子和孔的单层之间插入高$κ$介电。因此，对于超氟化相的摩尔晶格深度非常弱，理论上出现在10 K左右的临界温度以下。重要的是，对于具有有限动量的状态下的现实实验参数Interlayer Inprayer excitons Quasi-Gonsense，因此超氟化物在光学上是光学不活跃的，并且自发地流动。
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.
