Electrostatically confined Quantum Rings in bilayer Graphene

Details Electrostatically confined Quantum Rings in bilayer Graphene Electrostatically confined Quantum Rings in bilayer Graphene

2009-08-19

arxiv.org/abs/0908.2831v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 6 figures, to appear in Nano Letters

Scientific paper

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 $B_0 \to -B_0$ 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 anti-crossings, which arise due to the overlap of gate-confined and magnetically-confined states.

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