  The wake following a vessel in water is a signature interference effect of
moving bodies, and, as described by Lord Kelvin, is contained within a constant
universal angle. However, wakes may accompany different kinds of moving
disturbances in other situations and even in lattice systems. Here, we
investigate the effect of moving disturbances on a Fermi lattice gas of
ultracold atoms and analyze the novel types of wake patterns that may occur. We
show how at half-filling, the wake angles are dominated by the ratio of the
hopping energy to the velocity of the disturbance and on the angle of motion
relative to the lattice direction. Moreover, we study the difference between
wakes left behind a moving particle detector versus that of a moving potential
or a moving particle extractor. We show that these scenarios exhibit
dramatically different behavior at half-filling, with the "measurement wake"
following an idealized detector vanishing, though the motion of the detector
does still leaves a trace through a "fluctuation wake." Finally, we discuss the
experimental requirements to observe our predictions in ultracold fermionic
atoms in optical lattices.
