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We consider ground states of $L^2$-subcritical nonlinear Schr\"{o}dingerequation (1.1), which can be described equivalently by minimizers of thefollowing constraint minimization problem  $$ e(\rho):=\inf\{E_{\rho}(u):u\in \mathcal{H}(\mathbb{R}^d),\|u\|_2^2=1\}.$$The energy functional $E_{\rho}(u)$ is defined by $$E_{\rho}(u):=\frac{1}{2}\int_{\mathbb{R}^d}|\nabla u|^2dx+\frac{1}{2}\int_{\mathbb{R}^d}V(x)|u|^2dx-\frac{\rho^{p-1}}{p+1}\int_{\mathbb{R}^d}|u|^{p+1}dx,$$where $d\geq1$, $\rho>0$, $p\in\big(1, 1+\frac{4}{d}\big)$ and $0\leqV(x)\to\infty$ as $|x| \to\infty$. We present a detailed analysis on theconcentration behavior of ground states as $\rho\to\infty$, which extends theconcentration results shown in [22]. Moreover, the uniqueness of nonnegativeground states is also proved when $\rho$ is large enough.

Mass Concentration and Local Uniqueness of Ground States for $L^2$-subcritical Nonlinear Schr\"{o}dinger Equations