The study of many-body quantum systems with strong inter-particle interactions is of great interest for the understanding of novel materials. Ultracold atomic gases allow the precise tuning of interactions between atoms via a Feshbach resonance. We experimentally realise such gases with fermionic atoms at unitarity exhibiting the strongest interactions allowed by quantum mechanics. Using two-photon Bragg spectroscopy, we study the elementary excitations, mostly driven by pair correlated and single-particle excitations, in gases above and below the superfluid phase transition. In this talk, I will present our recent results on the precision measurements of the Contact many-body parameter as well as on the propagation of the phonon mode in the super- to normal fluid transition. Also, I will give an update on the progress made on the Australian Quantum Gas Microscope currently constructed at Swinburne University.
About the speaker
Dr Sascha Hoinka is an ARC DECRA Fellow in Prof Chris Vale’s group at Swinburne University of Technology, where he experimentally studies one-dimensional quantum wires of Fermi atoms. Within FLEET, Dr Hoinka has taken a lead role in designing and constructing Australia’s first quantum-gas microscope – a multi-institution facility hosted at Swinburne. Intended to be accessible by multiple research groups, this versatile facility will be used for precision studies on tailored quantum materials in and out of equilibrium within Research theme 3.