Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 41: Ultra-cold Atoms, Ions and BEC II (joint session A/Q)
Q 41.7: Talk
Thursday, March 14, 2024, 12:30–12:45, HS 1098
Fractional angular momentum quantization in Atomtronic circuits — •Wayne Jordan Chetcuti1, Juan Polo1, Andreas Osterloh1, and Luigi Amico1,2,3 — 1Quantum Research Center, Technology Innovation Institute, P.O. Box 9639 Abu Dhabi, UAE — 2Dipartimento di Fisica e Astronomia and INFN-Sezione di Catania, Via S. Sofia 64, 95127 Catania, Italy — 3Centre for Quantum Technologies, National University of Singapore 117543, Singapore
In this talk, I showcase the latest results for bosonic and fermionic matter-wave circuits in the context of Atomtronics. For attractively interacting bosons, the system sees the formation of bound states, which are the quantum analogs of bright solitons found in the mean-field regime. Considering the full many-body regime allows us access to a new phenomenology arising from the strong correlations in the system. Specifically, for a ring geometry pierced by a synthetic gauge field, we find that the angular momentum quantization per particle acquires fractional values depending on the number of particles constituting the bound state. The phenomenon of fractionalization manifests as new plateaus in the angular momentum and presents potentially important applications in the field of metrology and sensing. Analogous phenomenology is found in SU(N) fermionic systems in similar configurations. However, the physical origin of the angular momentum quantization present in these systems depends on the nature of the interactions, be they repulsive or attractive. The feature of fractionalization has promising applications to interferometry using these massive bound states in fermionic and bosonic systems.
Keywords: matter-waves; atomtronics; fractionalization; SU(N) fermions; bosons