  We demonstrate that the non-relativistic fermions open the energy gap when
the SU(N) gauge bosons, mediating the interaction between fermions, acquire the
mass. Surprisingly, even though there is the SU(N) gauge symmetry, there is
always one fermionic energy gap which is not degenerate to the rest of the
$N-1$ fermions for $N \ge 3$ in the fundamental representation.
