  We study the existence and nonexistence of solitary solutions with different
frequencies for a type of nonlinear extension of Dirac-Slater model. There are
three main ingredients in this paper. The first is the Pohozaev's identity of
nonlinear Dirac equations. Combine with variational identity, we find the
nonexistence results when the frequency $\omega$ is greater than $m$. The
second is critical point theorem of strongly indefinite functionals. With this,
we obtain existence result of $\omega\in (-m,m)$. The third, which is the new
main ingredient of this paper, is perturbation of the functional from the
second ingredient. Then we can show the existence of solitary solutions when
$\omega=-m$. An interesting outcome from our result is that we can see the left
and right are completely different in {\it Spectrum Zero Problem} which implies
a new phenomenon in quantum theory.
