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Paper detail

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

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 π phase shift in the current phase relation and the negative supercurrent indicating π 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.

preprint2010arXivOpen access
S. KimR. IshiguroM. KamioY. DodaE. WatanebeK. ShibataK. HirakawaH. Takayanagi
cond-mat.mes-hall
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S. KimR. IshiguroM. KamioY. DodaE. WatanebeK. ShibataK. HirakawaH. Takayanagi

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