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Q: Fachverband Quantenoptik und Photonik

Q 43: Poster – Quantum Systems

Q 43.5: Poster

Wednesday, March 4, 2026, 17:00–19:00, Philo 2. OG

Cavity-induced chiral states in two-dimesional fermi gas — •Aleksander Wagner — Physikalisches Institut, University of Bonn

We investigate topological out-of-equilibrium phases in a driven two-dimensional Fermi-Hubbard model with strong light-matter interactions induced by a dissipative optical cavity. The cavity induces phase-imprinted hopping along a lattice direction where tunneling is otherwise suppressed. Above a critical light-matter coupling strength, this process leads to a collective amplification of hopping and generates a dynamical gauge field, yielding an effective description reminiscent of the Hofstadter Hamiltonian. Moving beyond purely Hamiltonian frameworks, we characterize the steady state of the resulting open quantum system, shaped by the interplay of external driving, quantum fluctuations, and dissipation. We map out the associated non-equilibrium phase diagram and examine the emergence and stability of localized edge states and chiral edge currents in the presence of fluctuations. Our results provide insights into how robust topological phenomena in open quantum systems can be engineered and controlled.