{\pi} junction transition in InAs self-assembled quantum dot coupled with SQUID

S. Kim; R. Ishiguro; M. Kamio; Y. Doda; E. Watanebe; K. Shibata; K. Hirakawa; H. Takayanagi

doi:10.1063/1.3552715

{\pi} junction transition in InAs self-assembled quantum dot coupled with SQUID

Mesoscale and Nanoscale Physics 2011-02-10 v1

Authors: S. Kim , R. Ishiguro , M. Kamio , Y. Doda , E. Watanebe , K. Shibata , K. Hirakawa , H. Takayanagi

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Abstract

We report the transport measurements on the InAs self-assembled quantum dots (SAQDs) which have a unique structural zero-dimensionality, coupled to a superconducting quantum interference device (SQUID). Owing to the SQUID geometry, we directly observe a {\pi} phase shift in the current phase relation and the negative supercurrent indicating {\pi} junction behavior by not only tuning the energy level of SAQD by back-gate but also controlling the coupling between SAQD and electrodes by side-gate. Our results inspire new future quantum information devices which can link optical, spin, and superconducting state.

Keywords

quantum dots superconducting quantum interference devices superconductivity

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@article{arxiv.1010.5892,
  title  = {{\pi} junction transition in InAs self-assembled quantum dot coupled with SQUID},
  author = {S. Kim and R. Ishiguro and M. Kamio and Y. Doda and E. Watanebe and K. Shibata and K. Hirakawa and H. Takayanagi},
  journal= {arXiv preprint arXiv:1010.5892},
  year   = {2011}
}

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3 pages

{\pi} junction transition in InAs self-assembled quantum dot coupled with SQUID

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