Erlangen 2022 – scientific programme
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A: Fachverband Atomphysik
A 29: Ultra-cold atoms, ions and BEC (joint session A/Q)
A 29.15: Poster
Thursday, March 17, 2022, 16:30–18:30, P
Dipolar Supersolid States of Matter with Dysprosium — •Kevin Ng1, Jan-Niklas Schmidt1, Jens Hertkorn1, Mingyang Guo1, Sean Graham1, Paul Uerlings1, Ralf Klemt1, Tim Langen1, Martin Zwierlein2, and Tilman Pfau1 — 15. Physikalisches Institut and Center for Integrated Quantum Science and Technology, Universität Stuttgart — 2MIT-Harvard center for Ulatracold Atoms, Research Laboratory of Electronics, and Department of Physics, MIT
Ultracold dipolar gases are an established platform to realize exotic states of matter due to the anisotropic and long-range dipolar interaction between atoms. Recently, supersolid states of matter which have both a superfluid nature and crystal-like periodic density modulation have been realized with ultracold dysprosium.
With a self-organized array of dipolar quantum droplets in one dimension, we demonstrate supersolidity of the droplet array from the coherent nature of these droplets and have observed the low energy goldstone mode that exists as a consequence of the systems superfluidity. We map out the elementary excitations of droplet arrays in one and two dimensions and study in-situ the density fluctuations at the superfluid-supersolid phase transition. A peak in the extracted static structure factor identifies the transition region and allows us to connect the crystallization mechanism of the droplet array to the emergence of low-lying angular roton modes. Furthermore, we theoretically predict supersolid phases beyond droplets in two dimensions at higher densities, where density saturation favours honeycomb and stripe phases.