Observation of anti-bonding excited state in charging diagram of a few-electron double dot

Tsuyoshi Hatano, Yasuhiro Tokura, Shinichi Amaha, Toshihiro Kubo, Seigo Tarucha

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We fabricated a unique hybrid vertical-lateral double dot device with two dots coupled in parallel to study the excitation energy spectra with the number of electrons in each dot and inter-dot level detuning as parameters. We measured the charging diagram for a finite bias voltage and observed the tunnel-coupled bonding state and anti-bonding state. The separation between the two states is a direct measure of the inter-dot tunnel coupling energy. We use this energy and other characteristic energies derived from the charging diagram to characterize the exchange interaction energy.

Original languageEnglish
Pages (from-to)1238-1240
Number of pages3
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume40
Issue number5
DOIs
Publication statusPublished - 2008 Mar 1

Keywords

  • Bonding and anti-bonding states
  • Ground and excited states
  • Tunnel coupling

ASJC Scopus subject areas

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

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