Attractive and repulsive dipolar interaction in bilayers of indirect excitons
Attractive and repulsive dipolar interaction in bilayers of indirect excitons
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DOI：
10.1103/physrevb.103.045126
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发表时间：
2021-01-20
影响因子：
3.7
通讯作者：
Gossard, A. C.
中科院分区：
文献类型：
--
作者：
Choksy, D. J.;Xu, Chao;Gossard, A. C.
我们探讨了间接激子（IX）中的吸引偶极相互作用。对于单对耦合量子威尔斯（CQW）中的一层IX，面外IX电偶极子导致IX之间的排斥偶极相互作用。IX之间的吸引偶极相互作用在两个CQW异质结构中实现，其中两个IX层在两个分离的CQW对中。我们发现，无论是在实验测量和理论模拟中，在一个层中的IX的密度增加会导致在另一层中的IX的单调的能量减少。我们还发现了一个平面内的移动云的IX在一个层向云的IX在另一层。这种行为与吸引偶极相互作用定性一致。测得的IX能量降低和IX云移动值均高于相关液体理论给出的值。
We explore attractive dipolar interaction in indirect excitons (IXs). For one layer of IXs in a single pair of coupled quantum wells (CQWs), the out-of-plane IX electric dipoles lead to repulsive dipolar interaction between IXs. The attractive dipolar interaction between IXs is realized in a two-CQW heterostructure with two IX layers in two separated CQW pairs. We found both in experimental measurements and theoretical simulations that increasing density of IXs in one layer causes a monotonic energy reduction for IXs in the other layer. We also found an in-plane shift of a cloud of IXs in one layer towards a cloud of IXs in the other layer. This behavior is qualitatively consistent with attractive dipolar interaction. The measured IX energy reduction and IX cloud shift are higher than the values given by the correlated liquid theory.