• 文献标题:   Electronic Excited States in Bilayer Graphene Double Quantum Dots
  • 文献类型:   Article
  • 作  者:   VOLK C, FRINGES S, TERRES B, DAUBER J, ENGELS S, TRELLENKAMP S, STAMPFER C
  • 作者关键词:   graphene, bilayer graphene, quantum dot, double quantum dot, excited state
  • 出版物名称:   NANO LETTERS
  • ISSN:   1530-6984 EI 1530-6992
  • 通讯作者地址:   Rhein Westfal TH Aachen
  • 被引频次:   19
  • DOI:   10.1021/nl201295s
  • 出版年:   2011

▎ 摘  要

We report tunneling spectroscopy experiments on a bilayer graphene double quantum dot device that can be tuned by all-graphene lateral gates. The diameter of the two quantum dots are around 50 nm and the constrictions acting as tunneling barriers are 30 nm in width. The double quantum dot features additional energies on the order of 20 meV. Charge stability diagrams allow us to study the tunable interdot coupling energy as well as the spectrum of the electronic excited states on a number of individual triple points over a large energy range. The obtained constant level spacing of 1.75 meV over a wide energy range is in good agreement with the expected single-particle energy spacing in bilayer graphene quantum dots. Finally, we investigate the evolution of the electronic excited states in a parallel magnetic field.