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Let $\Gamma$ be a simplicial, finite, connected graph such that $\Gamma$ doesnot decompose as a nontrivial join. We prove that two notions of strongquasiconvexity and stability are equivalent in the right-angled Artin group$A_\Gamma$ (except for the case of finite index subgroups). We alsocharacterize non-trivial strongly quasiconvex subgroups of infinite index in$A_\Gamma$ (i.e. non-trivial stable subgroups in $A_\Gamma$) by quadratic lowerrelative divergence. These results strengthen the work ofKoberda-Mangahas-Taylor on characterizing purely loxodromic subgroups ofright-angled Artin groups.

Strong quasiconvexity, stability, and lower relative divergence in right-angled Artin groups