Magnetic-field-induced charge redistribution in disordered graphene double quantum dots
Name
PhysRevB.92.155408.pdf
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1.7 MB
Format
Adobe PDF
Checksum (MD5)
47f245b0ff304a994b75dfe3ea347c1a
Author(s)
Connolly, M. R.
Cresti, A.
Griffiths, J. P.
Jones, G. A. C.
Smith, C. G.
Chiu, Kuei-Lin
Date Issued
October 2015
Journal
Physical Review B
Publisher
American Physical Society
Citation
Chiu, K. L., M. R. Connolly, A. Cresti, J. P. Griffiths, G. A. C. Jones, and C. G. Smith. "Magnetic-field-induced charge redistribution in disordered graphene double quantum dots." Phys. Rev. B 92, 155408 (October 2015). © 2015 American Physical Society
Version
Final published version
Abstract
We have studied the transport properties of a large graphene double quantum dot under the influence of a background disorder potential and a magnetic field. At low temperatures, the evolution of the charge-stability diagram as a function of the B field is investigated up to 10 T. Our results indicate that the charging energy of the quantum dot is reduced, and hence the effective size of the dot increases at a high magnetic field. We provide an explanation of our results using a tight-binding model, which describes the charge redistribution in a disordered graphene quantum dot via the formation of Landau levels and edge states. Our model suggests that the tunnel barriers separating different electron/hole puddles in a dot become transparent at high B fields, resulting in the charge delocalization and reduced charging energy observed experimentally.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.92.155408
