Dresden 2026 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 31: Materials and Devices for Quantum Technology I

HL 31.1: Talk

Wednesday, March 11, 2026, 15:00–15:15, POT/0251

Escaping AB caging via Floquet engineering: photo-induced long-range interference in an all-band-flat model — Aamna Ahmed, •Mónica Benito, and Beatriz Perez-Gonzalez — Institute of Physics, University of Augsburg, 86159 Augsburg, Germany

Flat-band lattices hosting compact localized states are highly sensitive to external modulation, and the tailored design of a perturbation to imprint specific features becomes relevant. Here we show that periodic driving in the high-frequency regime transforms the all-flat-band diamond chain into one featuring two tunable quasi-flat bands and a residual flat band pinned at zero quasienergy. The interplay between lattice geometry and the symmetries of the driven system gives rise to drive-induced tunneling processes that redefine the interference conditions and open a controllable route to escaping Aharonov-Bohm (AB) caging. Under driving, the diamond chain effectively acquires the geometry of a dimerized lattice, exhibiting charge oscillations between opposite boundaries. This feature can be exploited to generate two-particle entanglement that is directly accessible experimentally. The resulting drive-engineered quasi-flat bands thus provide a versatile platform for manipulating quantum correlations, revealing a direct link between spectral fine structure and dynamical entanglement.

Keywords: Floquet engineering; diamond chain; Aharonov-Bohm caging; flat bands; photo-induced interference