  In this work, we investigate the conduction properties of strongly
interacting fermions flowing through a quasi two-dimensional, multimode
channel, which connects two atomic reservoirs. The atomic current in the
channel is controlled using a repulsive potential created by an off-resonant
laser beam. In analogy with an electronic field-effect transistor, this gate
potential controls the chemical potential in the channel while keeping the
temperature imposed by the reservoirs unchanged. With the gate potential as a
control parameter, we measure the current through the channel over a large
dynamic range and determine the density distribution in the channel region.
This allows us to observe the onset of superfluid flow of strongly interacting
fermions. These measurements are compared to the case of a weakly interacting
Fermi gas.
