Charge states of a collinearly and laterally coupled vertical triple quantum dot device

Shinichi Amaha, Tsuyoshi Hatano, Hiroyuki Tamura, Toshihiro Kubo, Soichiro Teraoka, Yasuhiro Tokura, David Guy Austing, Seigo Tarucha

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Three laterally coupled vertical single quantum dots (tQDs) in a collinear arrangement, with common source and drain electrodes, are investigated. The tQDs are formed inside three connected pillars (mesa1, mesa2, mesa3) with four side gate electrodes (G1, G2 (G2'), G3). Three families of Coulomb oscillation lines corresponding to charges in the numbers of electrons in the three dots are observed, and the few-electron charge configurations can be assigned. We also discuss the separation of adjacent Coulomb peak lines in the stability diagram, indicating that the inter-dot Coulomb energy between adjacent dots (mesa1-mesa2 and mesa2-mesa3) is significantly larger than that between the two non-adjacent dots (mesa1-mesa3).

Original languageEnglish
Pages (from-to)899-901
Number of pages3
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Issue number4
Publication statusPublished - 2010 Feb


  • Quantum dot molecules
  • Quantum dots
  • Stability diagram
  • Triple quantum dots

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics


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