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Title
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Electrostatically confined quantum rings in bilayer graphene
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Author
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Abstract
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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 (B0) dependence that is strikingly distinct from that of usual semiconductor quantum rings. In particular, the eigenvalues are not invariant under a B0 ¨ −B0 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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Language
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English
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Source (journal)
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Nano letters / American Chemical Society. - Washington
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Publication
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Washington
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2009
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ISSN
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1530-6984
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DOI
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10.1021/NL902302M
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Volume/pages
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9
:12
(2009)
, p. 4088-4092
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ISI
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000272395400023
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Full text (Publisher's DOI)
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