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 Speaker: Prof. Zhi-Qiang Wang，Utah State University, USA Inviter: Title: Concentration of nodal solutions for semiclassical NLS Time & Venue: 2019.4.29 16:00-17:00 N820 Abstract: We discuss the existence of localized nodal solutions for the semiclassical nonlinear Schr?dinger equation with the potential V assumed to have a local minimum point P. As $\epsilon \to 0$, we construct an infinite sequence of localized nodal solutions clustered at P and these solutions are of higher topological type in the sense that they are obtained from a minimax characterization of higher dimensional symmetric linking structure. Our method is rather robust without using any non-degeneracy condition.