Recent progress on fabrication and flat-band physics in 2D transition metal dichalcogenides moiré superlattices  

作　　者：Xinyu Huang Xu Han Yunyun Dai Xiaolong Xu Jiahao Yan Mengting Huang Pengfei Ding Decheng Zhang Hui Chen Vijay Laxmi Xu Wu Liwei Liu Yeliang Wang Yang Xu Yuan Huang 

机构地区：[1]Advanced Research Institute of Multidisciplinary Science,Beijing Institute of Technology,Beijing 100081,China [2]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [3]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [4]School of Integrated Circuits and Electronics,MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices,Beijing Institute of Technology,Beijing 100081,China [5]BIT Chongqing Institute of Microelectronics and Microsystems,Chongqing 401332,China

出　　处：《Journal of Semiconductors》2023年第1期43-55,共13页半导体学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.62022089,12174439,11874405,52272135,62274010,61971035);the National Key Research and Development Program of China(Grant Nos.2019YFA0308000,2021YFA1401300,2021YFA1401800,2018YFA0704200,2021YFA1400100,2020YFA0308800);Chongqing Outstanding Youth Fund(Grant No.2021ZX0400005);Beijing Institute of Technology Science and Technology Innovation Program Innovative Talent Science and Technology Funding SpecialProgram(No.2022CX01022);the Strategic Priority Research Program(B)of the Chinese Academy of Sciences(Grant Nos.XDB33000000)。

摘　　要：Moiré superlattices are formed when overlaying two materials with a slight mismatch in twist angle or lattice constant. They provide a novel platform for the study of strong electronic correlations and non-trivial band topology, where emergent phenomena such as correlated insulating states, unconventional superconductivity, and quantum anomalous Hall effect are discovered. In this review, we focus on the semiconducting transition metal dichalcogenides(TMDs) based moiré systems that host intriguing flat-band physics. We first review the exfoliation methods of two-dimensional materials and the fabrication technique of their moiré structures. Secondly, we overview the progress of the optically excited moiré excitons, which render the main discovery in the early experiments on TMD moiré systems. We then introduce the formation mechanism of flat bands and their potential in the quantum simulation of the Hubbard model with tunable doping, degeneracies, and correlation strength. Finally, we briefly discuss the challenges and future perspectives of this field.

关 键 词：flat-band physics two-dimensional materials moirésuperlattices Hubbard model moiréexcitons 

分 类 号：TN305[电子电信—物理电子学]