Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 54: Quantum Sensing II (joint session Q/QI)
Q 54.6: Talk
Thursday, March 13, 2025, 12:30–12:45, HS I PI
A localized impurity in a mesoscopic system of SU(N) fermions — Juan Polo1, Wayne Jordan Chetcuti1, Anna Minguzzi2, •Andreas Osterloh1, and Luigi Amico1 — 1TII, QRC, Abu Dhabi, UAE — 2Université Grenoble Alpes, CNRS, LPMMC, 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; persistent current; impurity model; atomtronics