Journal
PHYSICAL REVIEW B
Volume 89, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.89.075401
Keywords
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Funding
- EU
- EPSRC [EP/L013010/1]
- ERC
- Engineering and Physical Sciences Research Council [EP/L013010/1] Funding Source: researchfish
- EPSRC [EP/L013010/1] Funding Source: UKRI
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We find a systematic reappearance of massive Dirac features at the edges of consecutive minibands formed at magnetic fields B-p/q = p/q phi(0)/S providing rational magnetic flux through a unit cell of the moire superlattice created by a hexagonal substrate for electrons in graphene. The Dirac-type features in the minibands at B = B-p/q determine a hierarchy of gaps in the surrounding fractal spectrum and show that these minibands have topological insulator properties. Using the additional q-fold degeneracy of magnetic minibands at B-p/q, we trace the hierarchy of the gaps to their manifestation in the form of incompressible states upon variation of the carrier density and magnetic field.
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