论文标题
在WSE $ _2 $ -P中观察Interamayer Interamayer Ickiton气体
Observation of the Interlayer Exciton Gases in WSe$_2$ -p: WSe$_2$ Heterostructures
论文作者
论文摘要
由于电子和孔的空间分离，层间激子（IXS）的寿命比内层激子的寿命更长。因此，数十年来，他们一直被追求创建激子冷凝物。最近出现的二维（2D）材料（例如过渡金属二分法生成剂（TMD）及其范德华异质结构（HSS）的出现，其中两种不同的2D材料被分层在一起，为研究IXS创造了新的机会。在这里，我们介绍了由HBN/WSE $ _2 $/HBN/P：WSE $ _2 $/HBN组成的两个堆叠结构中IX气体的观察。由于TMD层之间的HBN间隔层的厚度不同，这两个不同结构的IX能量差异为82 MEV。我们证明，当温度和泵功率增加时，IXS的寿命会缩短。我们将这种非线性行为归因于螺旋钻过程。
Interlayer excitons (IXs) possess a much longer lifetime than intralayer excitons due to the spatial separation of the electrons and holes; hence, they have been pursued to create exciton condensates for decades. The recent emergence of two-dimensional (2D) materials, such as transition metal dichalcogenides (TMDs), and of their van der Waals heterostructures (HSs), in which two different 2D materials are layered together, has created new opportunities to study IXs. Here we present the observation of IX gases within two stacked structures consisting of hBN/WSe$_2$/hBN/p: WSe$_2$/hBN. The IX energy of the two different structures differed by 82 meV due to the different thickness of the hBN spacer layer between the TMD layers. We demonstrate that the lifetime of the IXs is shortened when the temperature and the pump power increase. We attribute this nonlinear behavior to an Auger process.
