Electrical control of interlayer exciton dynamics in atomically thin heterostructures
Electrical control of interlayer exciton dynamics in atomically thin heterostructures
复制标题
DOI：
10.1126/science.aaw4194
复制
发表时间：
2019-11-15
期刊：
影响因子：
56.9
通讯作者：
Kim, Philip
中科院分区：
文献类型：
--
作者：
Jauregui, Luis A.;Joe, Andrew Y.;Kim, Philip
由原子级薄的半导体过渡金属二硫属化物（TMD）构建的货车德瓦尔斯异质结构使得能够由不同层中的电子和空穴形成激子，从而产生具有大结合能和长寿命的层间激子。利用单层TMD的异质结构，我们实现了长寿命中性和带电层间激子的光和电产生。我们证明了中性层间激子可以在整个样品中传播，并且它们的传播可以通过激发功率和栅电极来控制。我们也使用欧姆接触的装置，以促进带电层间激子的漂移运动。激子的电产生和控制为实现玻色子复合粒子的完全电调谐量子操纵提供了一条途径。
A van der Waals heterostructure built from atomically thin semiconducting transition metal dichalcogenides (TMDs) enables the formation of excitons from electrons and holes in distinct layers, producing interlayer excitons with large binding energy and a long lifetime. By employing heterostructures of monolayer TMDs, we realize optical and electrical generation of long-lived neutral and charged interlayer excitons. We demonstrate that neutral interlayer excitons can propagate across the entire sample and that their propagation can be controlled by excitation power and gate electrodes. We also use devices with ohmic contacts to facilitate the drift motion of charged interlayer excitons. The electrical generation and control of excitons provide a route for achieving quantum manipulation of bosonic composite particles with complete electrical tunability.