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A remarkable property of twisted bilayer graphene (TBG) with small twistangle is the presence of a well-defined and conserved low-energy valley degreesof freedom1, which can potentially bring about new types of valley-associatedspontaneous-symmetry breaking phases. Electron-electron (e-e) interactions inthe TBG near the magic angle 1.1 degree can lift the valley degeneracy,allowing for the realization of orbital magnetism and topological phases2-11.However, direct measurement of the orbital-based magnetism in the TBG is stilllacking up to now. Here we report evidence for orbital magnetic momentgenerated by the moire-scale current loops in a TBG with a twist angle {\theta}~ 1.68 degree. The valley degeneracy of the 1.68 degree TBG is removed by e-einteractions when its low-energy van Hove singularity (VHS) is nearly halffilled. A large and linear response of the valley splitting to magnetic fieldsis observed, attributing to coupling to the large orbital magnetic momentinduced by chiral current loops circulating in the moire pattern. According toour experiment, the orbital magnetic moment is about 10.7 uB per moiresupercell. Our result paves the way to explore magnetism that is purely orbitalin slightly twisted graphene system.

Experimental evidence for orbital magnetic moments generated by moir\'e-scale current loops in twisted bilayer graphene