  In this paper, we are concerned with the coupled nonlinear Schr\"{o}dinger
system \begin{align*} \begin{cases} -\varepsilon^{2}\Delta
u+a(x)u=\mu_{1}u^{3}+\beta v^{2}u \ \ \ \ \mbox{in}\ \mathbb{R}^{N},\\
-\varepsilon^{2}\Delta v+b(x)v=\mu_{2}v^{3}+\beta u^{2}v \ \ \ \ \ \mbox{in}\
\mathbb{R}^{N}, \end{cases} \end{align*} where $1\leq N\leq3$,
$\mu_{1},\mu_{2},\beta>0$, $a(x)$ and $b(x)$ are nonnegative continuous
potentials, and $\varepsilon>0$ is a small parameter. We show the existence of
positive ground state solutions for the system above and also establish the
concentration behaviour as $\varepsilon\rightarrow0$, when $a(x)$ and $b(x)$
achieve 0 with a homogeneous behaviour or vanish in some nonempty open set with
smooth boundary.
