Excitation spectroscopy of few-electron states in artificial diatomic molecules

T. Hatano, Y. Tokura, S. Amaha, T. Kubo, S. Teraoka, S. Tarucha

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

We study the excitation spectroscopy of few-electron parallel coupled double quantum dots (DQDs). By applying a finite source drain voltage to a DQD, the first excited states observed in nonequilibrium charging diagrams can be classified into two kinds in terms of the total effective electron number in the DQD, assuming a core filling. When there are an odd (even) number of electrons, a one- (two-) electron antibonding (triplet) state is observed as the first excited state. On the other hand, at a larger source drain voltage, we observe higher excited states where additional single-particle excited levels are involved. Eventually, we identify the excited states with a calculation using the Hubbard model and, in particular, we elucidate the quadruplet state, which is normally forbidden by the spin blockade caused by the selection rule.

Original languageEnglish
Article number241414
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume87
Issue number24
DOIs
Publication statusPublished - 2013 Jun 27

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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