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TUE: Tuesday Contributed Sessions
TUE 8: Correlated Quantum Matter: Contributed Session to Symposium I
TUE 8.7: Talk
Tuesday, September 9, 2025, 15:45–16:00, ZHG009
Static impurity in a mesoscopic system of SU(N) fermionic matter-waves — •Juan Polo1, Wayne Chetcuti1, Andreas Osterloh1, Anna Minguzzi3, and Luigi Amico1,2 — 1Quantum Research Center, Technology Innovation Institute, Abu Dhabi 9639, UAE — 2Dipartimento di Fisica e Astronomia Ettore Majorana University of Catania, Via S. Sofia 64, 95123 Catania, Italy — 3Université Grenoble Alpes, CNRS, LPMMC, 38000 Grenoble, France
We investigate the effects of a static impurity, modeled by a localized barrier, in a one-dimensional mesoscopic system comprised of strongly correlated repulsive SU(N)-symmetric fermions. For a mesoscopic sized ring under the effect of an artificial gauge field, we analyze the particle density and the current flowing through the impurity at varying interaction strength, barrier height and number of components. We find a non-monotonic behaviour of the persistent current, due to the competition between the screening of the impurity, quantum fluctuations, and the phenomenon of fractionalization, a signature trait of SU(N) fermionic matter-waves in mesoscopic ring potentials. This is also highlighted in the particle density at the impurity site. We show that the impurity opens a gap in the energy spectrum selectively, constrained by the total effective spin and interaction. Our findings hold significance for the fundamental understanding of the localized impurity problem and its potential applications for sensing and interferometry in quantum technology.
Keywords: SU(N) fermions; Static Impurities; Cold Atoms; quantum gases