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

doi:10.1143/APEX.2.014501

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

SCI - Physics

Research output: Contribution to journal › Article › peer-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 language	English
Pages (from-to)	145011-145013
Number of pages	3
Journal	Applied Physics Express
Volume	2
Issue number	1
DOIs	https://doi.org/10.1143/APEX.2.014501
Publication status	Published - 2009 Jan 1

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

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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.",

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AU - Amaha, Shinichi

AU - Kubo, Toshihiro

AU - Hatano, Tsuyoshi

AU - Teraoka, Soichiro

AU - Shibatomi, Akihiro

AU - Tokura, Yasuhiro

AU - Tarucha, Seigo

PY - 2009/1/1

Y1 - 2009/1/1

N2 - 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.

AB - 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.

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

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