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A: Fachverband Atomphysik

A 36: Poster – Ultra-cold Atoms, Ions and BEC (joint session A/Q)

A 36.20: Poster

Donnerstag, 5. März 2026, 17:00–19:00, Philo 1. OG

Investigating structural phase transitions in dipolar quantum gases — Christian Gölzhäuser, •Lily Platt, Karthik Chandrashekara, Jianshun Gao, Manon Ballu, Wyatt Kirkby, and Lauriane Chomaz — Physikalisches Institut, Universität Heidelberg, Germany

Dipolar quantum gases have allowed the discovery of novel many-body states (e.g. supersolids), while at the same time providing an outstanding degree of control and tunability. In our new-generation experiment at Heidelberg we aim to study the behaviour of dipolar quantum gases of dysprosium in low dimensions and uniform tailored potentials. Here we report on our investigations on structural phase transitions both from a uniform to a density modulated state by tuning the s-wave scattering length and between a triangular crystal lattice modulation and a stripe-like modulation. We are able to observe the stripe modulation by tilting the orientation of our dipoles in plane through an external field. In both cases of the modulation we are able to observe phase coherence in a small range of scattering lengths below the superfluid to supersolid transition. We aim to study the nature of the different transitions to and within the density modulated regime.

Keywords: Ultracold; Dipolar; BEC; Supersolid; Phase Transition