Fabricating van der Waals (vdW) bilayer heterostructures (BL-HS) by stacking the same or different two-dimensional (2D) layers, offers a unique physical system with rich electronic and optical properties. Twist-angle between component layers has emerged as a remarkable parameter that can control the period of lateral confinement, and nature of the exciton (Coulomb bound electron-hole pair) in reciprocal space thus creating exotic physical states including moir\'e excitons. In this review article, we focus on opto-electronic properties of excitons in transition metal dichalcogenide (TMD) semiconductor twisted BL-HS. We look at existing evidence of moir\'e excitons in localized and strongly correlated states, and at nanoscale mapping of moir\'e superlattice and lattice-reconstruction. This review will be helpful in guiding the community as well as motivating work in areas such as near-field optical measurements and controlling the creation of novel physical states.
@article{arxiv.2008.07086,
title = {Moir\'e and beyond in transition metal dichalcogenide twisted bilayers},
author = {Kha Tran and Junho Choi and Akshay Singh},
journal= {arXiv preprint arXiv:2008.07086},
year = {2020}
}
Comments
published in 2D materials, https://doi.org/10.1088/2053-1583/abd3e7 v2 updated with new figure 6, information on g-factors and text changes