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Let $\mathcal L=-\Delta_{\mathbb H^n}+V$ be a Schr\"odinger operator on theHeisenberg group $\mathbb H^n$, where $\Delta_{\mathbb H^n}$ is thesub-Laplacian on $\mathbb H^n$ and the nonnegative potential $V$ belongs to thereverse H\"older class $RH_s$ with $s\geq Q/2$. Here $Q=2n+2$ is thehomogeneous dimension of $\mathbb H^n$. For given $\alpha\in(0,Q)$, thefractional integrals associated to the Schr\"odinger operator $\mathcal L$ isdefined by $\mathcal I_{\alpha}={\mathcal L}^{-{\alpha}/2}$. In this article,we first introduce the Morrey space $L^{p,\kappa}_{\rho,\infty}(\mathbb H^n)$and weak Morrey space $WL^{p,\kappa}_{\rho,\infty}(\mathbb H^n)$ related to thenonnegative potential $V$. Then we establish the boundedness of fractionalintegrals ${\mathcal L}^{-{\alpha}/2}$ on these new spaces. Furthermore, inorder to deal with certain extreme cases, we also introduce the spaces$\mathrm{BMO}_{\rho,\infty}(\mathbb H^n)$ and$\mathcal{C}^{\beta}_{\rho,\infty}(\mathbb H^n)$ with exponent $\beta\in(0,1]$.

Morrey spaces related to certain nonnegative potentials and fractional integrals on the Heisenberg groups