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Aligning magic-angle twisted bilayer graphene to boron nitride layers introduces a gate hysteresis coexisting with its strongly correlated phases. This bistability enables electrical switching between superconducting, metallic and insulating states.
Topological magnetic monopoles are non-local spin textures that are robust to thermal and quantum fluctuations, but they are difficult to study at the nanoscale in real space. Now, soft X-ray vector ptycho-tomography is demonstrated to determine the three-dimensional magnetization vector and emergent magnetic field of such magnetic monopoles in a ferromagnetic meta-lattice.
Electrons in two-dimensional semiconductor moiré materials experience competing magnetic interactions. Magneto-optical measurements of moiré devices with controlled screening of the Coulomb interactions now evidence a Wigner–Mott insulating state with frustrated magnetic interactions.