Bell pair creation in current of Kondo-correlated dot

ORAL

Abstract

Recently, local-Fermi-liquid properties in non-linear currents and shot noises through the Kondo dot have been investigated both theoretically and experimentally.\footnote{RS {\it et al}., Phys. Rev. Lett. {\bf 108}, 266401 (2012); M. Ferrier {\it et al}., Nat. Phys., Nature Physics {\bf 12}, 230–235 (2016).} We suggest a new entangled-electron-pair generator utilizing mechanism of quasiparticle-pair creation which has been observed as enhancement of shot noise in the quantum dot. Using the renormalized perturbation theory for an orbital-degenerate impurity Anderson model and the full counting statistics, we calculate the Clauser-Horne-Shimony-Holt type Bell’s correlator for currents \footnote{N. M. Chtchelkatchev {\it et al}., Phys. Rev. B {\bf 66}, 161320(R) (2002).} through correlated two different channels of a Kondo correlated dot. It is shown that residual exchange-interactions of the local-Fermi-liquid create spin-entangled quasiparticle-pairs in nonlinear current and this results in violation of the Bell’s inequality.

Authors

  • Rui Sakano

    Institute for solid state physics, the university of Tokyo

  • Akira Oguri

    Osaka City University, Department of physics, Osaka city university, Department of Physics, Osaka City University

  • Yunori Nishikawa

    Department of physics, Osaka city university

  • Eisuke Abe

    Spintronics research center, Keio university