1. surprises in high-temperature transport

Sarang Gopalakrishnan

Penn State University, USA

10 February 2022 Thu 10 am

                                      IBS Center for Theoretical Physics of Complex Systems (PCS), Administrative Office (B349), Theory Wing, 3rd floor

                                      Expo-ro 55, Yuseong-gu, Daejeon, South Korea, 34126 Tel: +82-42-878-8633                     

One might expect high-temperature transport to be incoherent and diffusive. However, many experimentally relevant one-dimensional systems, such as the Heisenberg and Hubbard models, feature long-lived quasiparticles that give rise to anomalous transport. I will present a quantitative theory of high-temperature transport in such systems, in terms of a dense gas of stable quasiparticles that scatter elastically off one another. This theory resolves some puzzles, but many remain; I will discuss how observables beyond linear response, which are straightforward to measure in ultracold atomic gases, can shed light on these.