Rectifying behavior in laterally coupled self-assembled quantum dots with asymmetric tunneling barriers

Shinichi Amaha, Toshihiro Kubo, Tsuyoshi Hatano, Soichiro Teraoka, Akihiro Shibatomi, Yasuhiro Tokura, Seigo Tarucha

Research output: Contribution to journalArticle

Abstract

We use laterally coupled two self-assembled quantum dots (QDs) to study the effect of asymmetric coupling to the source and drain electrodes. From the measured stability diagram, we confirm that one QD (Dot 1 ) is tunnel-coupled to the two electrodes, whereas the other (Dot 2) is only tunnel-coupled to one electrode. We observe the asymmetric current-voltage characteristics, when Dot 2 acts as an electron trap only for one bias polarity to impede the electron flow through Dot 1 due to the inter-dot Coulomb coupling. This phenomenon can be understood within the scheme of charge ratchet effect.

Original languageEnglish
Pages (from-to)145011-145013
Number of pages3
JournalApplied Physics Express
Volume2
Issue number1
DOIs
Publication statusPublished - 2009 Jan 1

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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    Amaha, S., Kubo, T., Hatano, T., Teraoka, S., Shibatomi, A., Tokura, Y., & Tarucha, S. (2009). Rectifying behavior in laterally coupled self-assembled quantum dots with asymmetric tunneling barriers. Applied Physics Express, 2(1), 145011-145013. https://doi.org/10.1143/APEX.2.014501