Tunable tunnel and exchange couplings in double quantum dots

S. Tarucha, T. Hatano, M. Stofa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We prepare a novel double dot device in a hybrid vertical-lateral geometry to study the electronic configurations of the tunnel-coupled and exchange-coupled states. In this device two two-dimensional quantum dots coupled side by side, and current flows vertically. From transport measurements we derive important parameters such as the inter- and mtra-dot Coulomb energies, the tunnel coupling energy and the potential detuning between the two dots to influence the electronic configurations in a double dot. Thus we confirm the formation of the Heitler-I.ondon two-electron state in the weak tunnel coupling regime, and also find that the tunnel and exchange couplings are tunable with coupling gate voltage and magnetic field.

Original languageEnglish
Title of host publicationProceedings of the 8th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2005
PublisherWorld Scientific Publishing Co. Pte Ltd
Pages92-98
Number of pages7
ISBN (Print)9812568581, 9789812568588
Publication statusPublished - 2006
Externally publishedYes
Event8th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2005 - Hatoyama, Saitama, Japan
Duration: 2005 Aug 222005 Aug 25

Publication series

NameProceedings of the 8th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2005

Other

Other8th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2005
Country/TerritoryJapan
CityHatoyama, Saitama
Period05/8/2205/8/25

Keywords

  • Electron spin
  • Exchange coupling
  • Quantum dot

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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