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

Koki Ono (), Toshiya Higomoto, Yugo Saito, Shun Uchino, Yusuke Nishida and Yoshiro Takahashi
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Koki Ono: Kyoto University
Toshiya Higomoto: Kyoto University
Yugo Saito: Kyoto University
Shun Uchino: Japan Atomic Energy Agency
Yusuke Nishida: Tokyo Institute of Technology
Yoshiro Takahashi: Kyoto University

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: 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.

Date: 2021
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DOI: 10.1038/s41467-021-27011-2

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