Probing Magnetically-Ordered Phases in Bilayer Graphene Quantum Dots

Bilayer graphene (BLG) hosts a variety of tunable quantum many-body phases driven by strong electron-electron interactions. While these phases have been studied in bulk systems[1], experiments probing them in quantum-confined structures remain limited. Here, we investigate magnetism in gate-defined bilayer graphene quantum dots, where both the charge density and perpendicular displacement field are gate tunable. Using a relatively large dot to achieve high-density resolution and reduced quantum level spacing, we access regimes where magnetically-ordered phases emerge. Magneto-transport measurements reveal distinct Coulomb peak evolutions with magnetic field, providing evidence of valley magnetic ordering over a large range of added electrons. These results demonstrate bilayer graphene quantum dots as a promising platform for exploring and tuning interaction-driven phases in two-dimensional materials.

[1] e.g., Seiler et al., Nature 608, 298–302 (2022).