Existence of ground state solutions to some Nonlinear Schr\"{o}dinger equations on lattice graphs

In this paper, we study the nonlinear Schr\"{o}dinger equation $-\Delta u+V(x)u=f(x,u)$on the lattice graph $\mathbb{Z}^{N}$. Using the Nehari method, we prove that when $f$ satisfies some growth conditions and the potential function $V$ is periodic or bounded, the above equation admits a ground state solution. Moreover, we extend our results from $\mathbb{Z}^{N}$ to quasi-transitive graphs.