Massive Dirac fermions and Hofstadter butterfly in a van der Waals heterostructure - PubMed (original) (raw)
. 2013 Jun 21;340(6139):1427-30.
doi: 10.1126/science.1237240. Epub 2013 May 16.
Affiliations
- PMID: 23686343
- DOI: 10.1126/science.1237240
Massive Dirac fermions and Hofstadter butterfly in a van der Waals heterostructure
B Hunt et al. Science. 2013.
Abstract
van der Waals heterostructures constitute a new class of artificial materials formed by stacking atomically thin planar crystals. We demonstrated band structure engineering in a van der Waals heterostructure composed of a monolayer graphene flake coupled to a rotationally aligned hexagonal boron nitride substrate. The spatially varying interlayer atomic registry results in both a local breaking of the carbon sublattice symmetry and a long-range moiré superlattice potential in the graphene. In our samples, this interplay between short- and long-wavelength effects resulted in a band structure described by isolated superlattice minibands and an unexpectedly large band gap at charge neutrality. This picture is confirmed by our observation of fractional quantum Hall states at ± 5/3 filling and features associated with the Hofstadter butterfly at ultrahigh magnetic fields.
Comment in
- Physics. Critical mass in graphene.
Fuhrer MS. Fuhrer MS. Science. 2013 Jun 21;340(6139):1413-4. doi: 10.1126/science.1240317. Science. 2013. PMID: 23788788 No abstract available.
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