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- W2136699226 abstract "The fractal spectrum of magnetic minibands (Hofstadter butterfly), induced by the moir'e superlattice of graphene on a hexagonal crystal substrate, is known to exhibit gapped Dirac cones. We show that the gap can be closed by slightly misaligning the substrate, producing a hierarchy of conical singularities (Dirac points) in the band structure at rational values $mathrm{ensuremath{Phi}}=(p/q)(h/e)$ of the magnetic flux per supercell. Each Dirac point signals a switch of the topological quantum number in the connected component of the quantum Hall phase diagram. Model calculations reveal the scale-invariant conductivity $ensuremath{sigma}=2q{e}^{2}/ensuremath{pi}h$ and Klein tunneling associated with massless Dirac fermions at these connectivity switches." @default.
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- W2136699226 date "2014-05-13" @default.
- W2136699226 modified "2023-10-07" @default.
- W2136699226 title "Emergence of Massless Dirac Fermions in Graphene’s Hofstadter Butterfly at Switches of the Quantum Hall Phase Connectivity" @default.
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- W2136699226 doi "https://doi.org/10.1103/physrevlett.112.196602" @default.
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