  The effect of a nonmagnetic impurity on the subgap electronic spectrum in a
d-wave superconductor in the Fulde-Ferrell-Larkin-Ovchinnikov state is
investigated. In a pure system, the spatial variation of the order parameter
(OP) of the FFLO state forms a two-dimensional lattice, and there exist two
types of sub-gap quasi-particle states. Our numerical iterations indicate that
an OP saddle point, and slightly less so energetically, an OP extremum favor to
be pinned at the impurity site. The local density of states and the fixed-bias
map reveal the subtle effects of an impurity on the subgap energy spectrum,
because the OP changes sign in both the (relative) momentum space and the real
space.
