Observation of spin-space quantum transport induced by an atomic quantum point contact

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  • Ono, Koki
    Department of Physics, Graduate School of Science, Kyoto University
  • Higomoto, Toshiya
    Department of Physics, Graduate School of Science, Kyoto University
  • Saito, Yugo
    Department of Physics, Graduate School of Science, Kyoto University
  • Uchino, Shun
    Advanced Science Research Center, Japan Atomic Energy Agency
  • Nishida, Yusuke
    Department of Physics, Tokyo Institute of Technology
  • Takahashi, Yoshiro
    Department of Physics, Graduate School of Science, Kyoto University

Abstract

Quantum transport is ubiquitous in physics. So far, quantum transport between terminals has been extensively studied in solid state systems from the fundamental point of views such as the quantized conductance to the applications to quantum devices. Recent works have demonstrated a cold-atom analog of a mesoscopic conductor by engineering a narrow conducting channel with optical potentials, which opens the door for a wealth of research of atomtronics emulating mesoscopic electronic devices and beyond. Here we realize an alternative scheme of the quantum transport experiment with ytterbium atoms in a two-orbital optical lattice system. Our system consists of a multi-component Fermi gas and a localized impurity, where the current can be created in the spin space by introducing the spin-dependent interaction with the impurity. We demonstrate a rich variety of localized-impurity-induced quantum transports, which paves the way for atomtronics exploiting spin degrees of freedom.

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