Double quantum dots defined in bilayer graphene

D. P. Żebrowski, F. M. Peeters, and B. Szafran
Phys. Rev. B 96, 035434 – Published 25 July 2017

Abstract

Artificial molecular states of double quantum dots defined in bilayer graphene are studied with the atomistic tight-binding method and its low-energy continuum approximation. We indicate that the extended electron wave functions have opposite parities on sublattices of the layers and that the ground-state wave-function components change from bonding to antibonding with the interdot distance. In the weak-coupling limit, the one most relevant for quantum dots defined electrostatically, the signatures of the interdot coupling include, for the two-electron ground state, formation of states with symmetric or antisymmetric spatial wave functions split by the exchange energy. In the high-energy part of the spectrum the states with both electrons in the same dot are found with the splitting of energy levels corresponding to simultaneous tunneling of the electron pair from one dot to the other.

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  • Received 20 March 2017
  • Revised 19 June 2017

DOI:https://doi.org/10.1103/PhysRevB.96.035434

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

D. P. Żebrowski1, F. M. Peeters2, and B. Szafran1

  • 1Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, aleja Mickiewicza 30, 30-059 Kraków, Poland
  • 2Departement Fysica, Universiteit Antwerpen, Groenenborgerlaan 171, 2020 Antwerpen, Belgium

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Issue

Vol. 96, Iss. 3 — 15 July 2017

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