Excitonic Properties and Spin-Valley Physics
The atomically thin two-dimensional semiconductor, such as transition metal dichalcogenides (TMDs), has provided an ideal platform for studying excitons in the truly 2D limit. Excitons and excitonic complexes are tightly bound due to the enhanced Coulomb interaction from reduced dimensionality. In addition, the valley degree of freedom, which couples to spin in TMDs, could lead to spin/valley-dependent exciton-exciton interaction. Combining with the twist-angle dependent electronic structure from homo- and heterobilayer system, more is waiting to be explored.
![Repulsive dipolar interaction [1]](https://images.squarespace-cdn.com/content/v1/6057bb81a8b1a1028f3905a9/1616366052548-2QQL9IAAFM4DFSK9JYYA/Figure_1_V7_modified.png)
Repulsive dipolar interaction [1]
![Spin-dependent exciton exchange interactions [2]](https://images.squarespace-cdn.com/content/v1/6057bb81a8b1a1028f3905a9/1616365989836-YYNBCC6ET55P0FOM72F6/Fig1_V7+copy.png)
Spin-dependent exciton exchange interactions [2]
[1] Weijie Li*, Xin Lu*, Sudipta Dubey, Luka Devenica and Ajit Srivastava. Dipolar interactions between field-tuneable, localized emitters in van der Waals heterostructures. Nature Materials 19, 624-629, 2020.
News & Views: https://www.nature.com/articles/s41563-020-0693-9?draft=journal&proof=t
[2] Weijie Li*, Xin. Lu*, Jiatian Wu* and Ajit Srivastava. Optical control of valley Zeeman effect through many-exciton interactions. Nature Nanotechnology. 16, 147-152, 2021.
Nature blog-Behind the paper: https://devicematerialscommunity.nature.com/posts/magnetic-field-begins-to-see-the-light-in-2d-materials