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Quantum transport is ubiquitous in physics. So far, quantum transport betweenterminals has been extensively studied in solid state systems from thefundamental point of views such as the quantized conductance to theapplications to quantum devices. Recent works have demonstrated a cold-atomanalog of a mesoscopic conductor by engineering a narrow conducting channelwith optical potentials, which opens the door for a wealth of research ofatomtronics emulating mesoscopic electronic devices and beyond. Here we realizean alternative scheme of the quantum transport experiment with ytterbium atomsin a two-orbital optical lattice system. Our system consists of amulti-component Fermi gas and a localized impurity, where the current can becreated in the spin space by introducing the spin-dependent interaction withthe impurity. We demonstrate a rich variety of localized-impurity-inducedquantum transports, which paves the way for atomtronics exploiting spin degreesof freedom.

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