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A: Fachverband Atomphysik

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

A 26.11: Poster

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

Observation and detection of crystal phases with variable structures in dipolar quantum gases — •Jianshun Gao, Karthik Chandrashekara, Christian Gölzhäuser, Lily Platt, Julian Kusch, Rémy Dolbeault, and Lauriane Chomaz — Physikalisches Institut, Im Neuenheimer Feld 226, Heidelberg, Germany

Dipolar quantum gases have been found to display exotic phases from anisotropic superfluids, to sefl-bound fluids, and to crystalline states, also including supersolids. These phases spontaneously arise depending on the interactions parameters, trap geoemtries, and atom number in the system. In planar trap geometries, while only triangular crystalline states have yet been observed, various structures of the crystalline states have been predicted. In our experiment, we explore the phase diagram of a quantum gas of Dysprosium atoms in a surfboard-shaped trap by independently controlling the contact interaction and the dipole orientation angle. We observe that the gas transitions from a uniform superfluid to density-modulated states, with either triangular or stripe arrangement. In this poster, we will present an analyse protocol for detecting the density-modulated patterns from the high-intensity in-situ absorption imaging, and extracting the important information: number, dimensions, and anisotropy of the crystal structures, number of neighboring structures and typical distance between them.

Keywords: Dipolar quantum gases; Superfluids; Dysprosium; Density-modulated states; Absorption imaging