Physics

Dr. Rick Mukherjee
Rice University

Understanding the emergent behaviour of many-body quantum systems is an important subject of ongoing research in many areas of physics. One way to understand many-body dynamics is to characterise the underlying many-body interactions. In this context, many-body Rydberg-dressed
interactions are fascinating as they can potentially create exotic phases of matter and entangled states. I will talk about using Ramsey spectroscopy to observe Rydberg-dressed interactions in a many-body system well within the experimentally measured lifetime. The sensitivity of the contrast dynamics to the shape of the interaction is revealed by its dependence on the density of the cloud
of strongly interacting atoms. Yet another way to probe many-body systems is to measure the correlations in the system which is so fundamental to condensed matter and AMO as well as for quantum sensing and computing. I will discuss a general method to visualise spin correlations and exemplify its broad usefulness in ultra-cold matter by considering specific spin models. There is one-to-one map between the spin correlations and the three-dimensional geometrical object,
analogous to the map between the single spin and the Bloch vector. This object makes the geometric structure of the correlations manifest.