Title
Magnetic field dependence of energy levels in biased bilayer graphene quantum dots Magnetic field dependence of energy levels in biased bilayer graphene quantum dots
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
New York, N.Y :American Physical Society ,
Subject
Physics
Source (journal)
Physical review B / American Physical Society. - New York, N.Y, 2016, currens
Volume/pages
93(2016) :8 , 9 p.
ISSN
2469-9969
2469-9969
Article Reference
085401
Carrier
E-only publicatie
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Using the tight-binding approach, we study the influence of a perpendicular magnetic field on the energy levels of hexagonal, triangular, and circular bilayer graphene (BLG) quantum dots (QDs) with zigzag and armchair edges. We obtain the energy levels for AB (Bernal)-stacked BLG QDs in both the absence and the presence of a perpendicular electric field (i.e., biased BLG QDs). We find different regions in the spectrum of biased QDs with respect to the crossing point between the lowest-electron and -hole Landau levels of a biased BLG sheet. Those different regions correspond to electron states that are localized at the center, edge, or corner of the BLG QD. Quantum Hall corner states are found to be absent in circular BLG QDs. The spatial symmetry of the carrier density distribution is related to the symmetry of the confinement potential, the position of zigzag edges, and the presence or absence of interlayer inversion symmetry.
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Full text (open access)
https://repository.uantwerpen.be/docman/irua/5f60f5/131623.pdf
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