Finding Ordered State in a Disordered Jungle

A rich portfolio of emergent phenomena has been discovered in twisted two-dimensional (2D) moiré systems, including strongly correlated insulators,¹ superconductivity,² integer and fractional Chern insulators (ChIs),^3–5 magnetism,⁶ and interfacial ferroelectricity.^7,8 The twist angle is a critical knob to modulate the properties of moiré materials. However, such a small twist angle (1°–2°) is often not thermodynamically stable for the moiré systems leading to strong reconstruction of the moiré lattice, which introduces an unconventional type of twist angle disorder.