  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.
