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Q: Fachverband Quantenoptik und Photonik

Q 31: Ultracold Matter IV – Bosons, Rydberg Systems, and Others (joint session Q/A)

Q 31.8: Vortrag

Mittwoch, 4. März 2026, 16:15–16:30, P 2

Dipole induced phonon topology in one-dimensional Rydberg atom arrays — •Christian Gommeringer — Universität Tübingen

We study the topological properties of phonons in trapped Rydberg atom arrays, which arise from dipole-dipole interactions between the atoms. For various one-dimensional geometries, from zigzag to armchair configurations, we analyze the symmetries of the phononic Hamiltonian which give rise to topologically localized phonon excitations on the system boundaries. Because the phonon-phonon interactions here do not naturally respect chiral symmetry, which is crucial for realizing 1D topological phases, we show how an appropriate, geometry-dependent choice of the dipole moment orientation can restore this symmetry and enable topological characterization. The interplay between two phononic degrees of freedom in the harmonic trap potential, mediated by the dipole-dipole interactions, leads to interesting topological phases with winding numbers between zero and two. The corresponding edge states exhibit strong localization and robustness, making them potentially useful for applications in Rydberg-array-based quantum transport.

As an outlook we aim to explore how the phonon topology influences transport phenomena. Topological states in the electronic degrees of freedom in Rydberg arrays have already been shown to support topologically protected photon pumping. Studying the effect of spin-phonon coupling can provide new control mechanisms in the realm of topological transport.

Keywords: topological phonons; Rydberg atoms; quantum transport