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FRI: Friday Contributed Sessions

FRI 3: Quantum Chaos

FRI 3.1: Talk

Friday, September 12, 2025, 10:45–11:00, ZHG003

Chaos and integrability in partially distinguishable fermions on a lattice — •Caroline Stier, Edoardo Carnio, Gabriel Dufour, and Andreas Buchleitner — Albert-Ludwigs-Universität Freiburg

We study the fermionic many-body quantum dynamics generated by a Hubbard-like Hamiltonian with nearest neighbour interaction and a continuously tunable level of distinguishability of the particles. For not strictly indistinguishable fermions, distinct invariant symmetry sectors of the many-body Hilbert space are populated, with tangible impact on the many-body dynamics. For indistinguishable fermions, the dynamics is integrable; for partially distinguishable fermions, however, numerical results show the emergence of chaotic dynamics. We explain the breakdown of integrability with analytical arguments, in tandem with simulations of the dynamics within specific symmetry sectors.

Keywords: quantum chaos; integrability; partial distinguishability; fermions