Citation: | Sofiane Khoutir. LEAST ENERGY SIGN-CHANGING SOLUTIONS FOR SUPER-QUADRATIC SCHRÖDINGER-POISSON SYSTEMS IN $ \mathbb{R}^{3} $[J]. Journal of Applied Analysis & Computation, 2021, 11(3): 1520-1534. doi: 10.11948/20200274 |
In this paper, we study the following Schrödinger-Poisson systems
$ \begin{equation*} \begin{cases} -\Delta u+Vu+\lambda \phi u = f(u), &\quad x \in \mathbb{R}^{3},\\ -\Delta \phi = u^{2}, &\quad x \in \mathbb{R}^{3}, \end{cases} \end{equation*} $
where $ V, \: \lambda>0 $ and $ f \in C\left(\mathbb{R}, \mathbb{R}\right) $. Under some relaxed assumptions on $ f $, using variational methods in combination with the Pohozǎev identity, we prove that the above system possesses a least energy sign-changing solution and a ground state solution provided that $ \lambda $ is sufficiently small. Moreover, we prove that the energy of a sign-changing solution is strictly larger than that of the ground state solution. Our results generalize and extend some recent results in the literature.
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