Adv Mater 2023 Sep 09;:e2305175. doi: 10.1002/adma.202305175.

Recent Advances in Moiré Superlattice Systems by Angle-Resolved Photoemission Spectroscopy.

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The last decade has witnessed a flourish in two-dimensional (2D) materials including graphene and transition metal dichalcogenides (TMDs) as atomic-scale Legos. Artificial moiré superlattices via stacking 2D materials with a twist angle and/or a lattice mismatch have recently become a fertile playground exhibiting a plethora of emergent properties beyond their building blocks. These rich quantum phenomena stem from their nontrivial electronic structures that have been effectively tuned by the moiré periodicity. Modern angle-resolved photoemission spectroscopy (ARPES) can directly visualize electronic structures with decent momentum, energy, and spatial resolution, thus could provide enlightening insights into fundamental physics in moiré superlattice systems and guides for designing novel devices. In this review, firstly a brief introduction is given on advanced ARPES techniques and basic ideas of band structures in a moiré superlattice system. Then ARPES research results of various moiré superlattice systems are highlighted, including graphene on substrates with small lattice mismatches, twisted graphene/TMD moiré systems, and high-order moiré superlattice systems. Finally, we discuss on important questions that remain open, challenges in current experimental investigations and present an outlook on this field of research. This article is protected by copyright. All rights reserved.

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