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The magnetic susceptibility of a triangular-graphene-quantum-dot-like systemwas examined by using the determinant quantum Monte Carlo method. We focused onthree kinds of zigzag edge quantum dots or rings, namely the triangulargraphene quantum ring, twist bilayer triangular graphene quantum dot, and twistbilayer triangular graphene quantum ring. Thetriangular-graphene-quantum-dot-like system exhibits robust edge ferromagneticbehavior, which is independent of size, monolayer or bilayer, and dot or ringshape, according to the unbiased numerical results. At half filling, the edgemagnetic susceptibility is increased by on-site interaction, especially in lowtemperature region. Applications of this system in spintronics may benefit fromthe robust edge ferromagnetic behavior.

Zigzag edge ferromagnetism of triangular-graphene-quantum-dot-like system