The quantum impurity problem is relevant to a range of different systems in physics, and it continues to be a highly active area of research. In ultracold atomic gases, the impurity problem can be realised by introducing a small number of atoms of a different species into a background gas. The interaction between the impurity and the background medium can be tuned via an external magnetic field, the so-called Feshbach resonance, allowing us to investigate how correlations build up in quantum matter. In this talk, I will review our recent work on radio-frequency spectroscopy and Ramsey interference, which probe the formation of quasiparticles in the impurity problem.
About the speaker
Dr Weizhe Liu is a Research Fellow working in the fields of condensed matter physics and quantum physics at Monash University.
With FLEET’s Jesper Levinsen and Meera Parish, Dr Liu is exploring the transport properties of laser-trapped cold atom clouds, as part of FLEET’s Research Theme 2 (exciton superfluids) and 3 (light-transformed materials).