π junction transition in InAs self-assembled quantum dot coupled with SQUID

Details π junction transition in InAs self-assembled quantum dot coupled with SQUID π junction transition in InAs self-assembled quantum dot coupled with SQUID

2010-10-28

arxiv.org/abs/1010.5892v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages

Scientific paper

10.1063/1.3552715

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.

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