Two dimensional (2D) layered materials have attracted intense research interest in both fundamental study and practical applications because of their intriguing optical and electronic properties. Thanks to the weak interlayer van der Waals force, these 2D materials can be further stacked to form artificial heterostructures without constraints from lattice mismatch. There, new degree of freedoms including components, structures and twisting angles provide unprecedented control of properties and functionalities. For example, heterostructures consisting of 2D semiconductors with strong light-matter interaction and excitonic effect have opened new door to ultrathin optoelectronics. Moreover, when two monolayers are super-imposed with carefully tuned twisting angles, a 2D moiré superlattice is formed, which has led to recent breakthrough in superconducting and correlated physics.

The scope of this special topic in Frontiers of Physics would cover all the aspects of experimental and theoretical studies on the optical properties and photophysical processes in 2D materials, heterostructures and Moiré Superlattices, including but not limited to:

● 2D exciton optical properties and dynamics;

●  Interfacial exciton charge/energy transfer;

●  Intralayer/interlayer exciton recombination and transport;

● Spin and valley relaxation and manipulation;

● Nonlinear optics and modulation;

● Moiré modulated optical properties and exciton dynamics;

●  Correlated electronic states and hybrid exciton.

We are looking for scientists from China and overseas to contribute Review, Topical Review, Report, View & Perspective, or Research Article in the foresaid areas. Please feel free to choose a striking topic that best fits the issue. Co-authorship is welcome. There is no strict length limit for each article, and for each review at least 15 pages length is highly expected. 

Sincerely,

Qihua Xiong, Tsinghua University, qihua_xiong@tsinghua.edu.cn

Tian Jiang, National University of Defense Technology, tjiang@nudt.edu.cn

Luyi Yang, Tsinghua University, luyi-yang@mail.tsinghua.edu.cn

Haiming Zhu, Zhejiang University, hmzhu@zju.edu.cn