Journal
NANO LETTERS
Volume 9, Issue 12, Pages 4088-4092Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl902302m
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Funding
- Flemish Science Foundation (FWO-VI)
- Belgian Science Policy (IAP)
- Bilateral program between Flanders and Brazil
- Brazilian Council for Research (CNPq)
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We propose a new system where electron and hole states are electrostatically confined into a quantum ring in bilayer graphene. These structures can be created by tuning the gap of the graphene bilayer using nanostructured gates or by position-dependent doping. The energy levels have a magnetic field (B-0) dependence that is strikingly distinct from that of usual semiconductor quantum rings. In particular, the eigenvalues are not invariant under a B-0 -> -B-0 transformation and, for a fixed total angular momentum index m, their field dependence is not parabolic, but displays two minima separated by a saddle point. The spectra also display several anticrossings, which arise due to the overlap of gate-confined and magnetically confined states.
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