Year: 2025
Type: article
Abstract: We report on a double moiré system consisting of four graphene layers, where the top and bottom pairs form small-twist-angle bilayer graphene, and the middle interface has a large rotational mismatch. This system shows clear signatures of two sets of spatially separated flat bands associated with the top and bottom twisted bilayer graphene subsystems, each independently tunable. Thermodynamic analysis reveals weak correlations between bilayers that allow the chemical potential to be measured as a function of carrier density for each constituent TBG. We find that correlated insulating states at integer number of electrons per moiré unit cell are most robust near magic angle, whereas gapped states at neutrality are more robust at larger twist angles.
Source: Physical Review Letters
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
Awards: G1419553934, G1844613435, G2888672020, PFI-TT: Development of a Bubble Printer for Low-cost, Rapid Fabrication of High-Resolution Displays, PLANAR SYSTEMS FOR QUANTUM INFORMATION, G5122498638, Collaborative Research: Combined transport and scanning probe study of twisted van der Waals devices, G6220309777, G7452299184, Center for Dynamics and Control of Materials
OpenAlex ID: W4408226397