Resonance-hybrid states in a triple quantum dot

S. Amaha, T. Hatano, H. Tamura, S. Teraoka, T. Kubo, Y. Tokura, D. G. Austing, S. Tarucha

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Delocalization by resonance between contributing structures explains the enhanced stability of resonance-hybrid molecules. Here we report the realization of resonance-hybrid states in a few-electron triple quantum dot (TQD) obseved by excitation spectroscopy. The stabilization of the resonance-hybrid state and the bond between contributing states are achieved through access to the intermediate states with double occupancy of the dots. This explains why the energy of the hybridized singlet state is significantly lower than that of the triplet state. The properties of the three-electron doublet states can also be understood with the resonance-hybrid picture and geometrical phase. As well as for fundamental TQD physics, our results are useful for the investigation of materials such as quantum dot arrays, quantum information processors, and chemical reaction and quantum simulators.

Original languageEnglish
Article number081301
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number8
DOIs
Publication statusPublished - 2012 Feb 2

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Amaha, S., Hatano, T., Tamura, H., Teraoka, S., Kubo, T., Tokura, Y., Austing, D. G., & Tarucha, S. (2012). Resonance-hybrid states in a triple quantum dot. Physical Review B - Condensed Matter and Materials Physics, 85(8), [081301]. https://doi.org/10.1103/PhysRevB.85.081301