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 journalArticlepeer-review

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)

Fingerprint Dive into the research topics of 'Rectifying behavior in laterally coupled self-assembled quantum dots with asymmetric tunneling barriers'. Together they form a unique fingerprint.

Cite this