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A: Fachverband Atomphysik

A 26: Poster – Ultracold Matter (joint session Q/A)

A 26.29: Poster

Mittwoch, 4. März 2026, 17:00–19:00, Philo 2. OG

Effects of spin-phonon coupling on Rydberg facilitation in a lattice — •Benno Bock, Daniel Brady, and Michael Fleischhauer — University of Kaiserslautern-Landau, Kaiserslautern, Germany

In recent years, Rydberg atoms have proven themselves as a powerful tool for quantum simulators, one of the reasons being their strong and long-ranged interactions. One interesting phenomenon resulting from these interactions is Rydberg facilitation, or anti-blockade, where an atom excited to the Rydberg state moves a neighboring atom into resonance with a laser field, thus facilitating a fast excitation cascade in a regular lattice of trapped atoms. However, along with strong dipolar interactions between Rydberg atoms (spins), come mechanical forces coupling Rydberg atoms to high motional states (phonons) in their respective tweezer traps. For a chain of atoms trapped in tweezer arrays under the facilitation constraint, we numerically simulate the dynamics of the spin-phonon coupling. To this end, we approximate the van-der-Waals interaction potential up to second order. In particular we investigate how the motional degrees of freedom affect the spreading dynamics of Rydberg excitations and indentify parameter regimes of distinct behaviors not seen in previous work [PRL 132, 133401 (2024)], such as Bloch oscillations of excitation chains and a localization regime.

Keywords: Rydberg atoms; Tweezer arrays; Quantum Simulation; Dressed phonons; Facilitation