Effects of observation on quantum interference in a laterally coupled double quantum dot using a quantum dot charge sensor

T. Kubo, Y. Tokura, T. Hatano, S. Amaha, S. Teraoka, S. Tarucha

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We theoretically investigated the effects of the observation by a quantum dot charge sensor on an Aharonov-Bohm effect in a laterally coupled double quantum dot using the interpolative 2nd-order perturbation theory. In particular, we introduce the notion of the coherent indirect coupling, which characterizes the strength of the indirect coupling between two quantum dots via the reservoir. As the Coulomb interaction VS for the charge sensing increases, the linear conductance through a double quantum dot decreases because of the many-body correlation effect. The visibility of Aharonov-Bohm oscillation in the linear conductance behaves super-linearly for weak sensing interaction regime and sub-linearly for strong sensing interaction regime.

Original languageEnglish
Pages (from-to)852-855
Number of pages4
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume42
Issue number4
DOIs
Publication statusPublished - 2010 Feb 1

Keywords

  • Aharonov-Bohm effect
  • Laterally coupled double quantum dot
  • Quantum dot charge sensor
  • Visibility

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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