Speaker
Devendra Singh Bhakuni
(Abdus Salam International Centre for Theoretical Physics (ICTP))
Description
Symmetries play a crucial role in shaping transport in quantum many-body systems, often leading to departures from conventional diffusion. In this talk, I will discuss transport at infinite temperature in chiral integrable systems with global SU(2) symmetry. We study both Hamiltonian and Floquet (circuit) realizations, finding the dynamics exhibit a dynamical exponent z=3/2, consistent with superdiffusion in the Kardar–Parisi–Zhang (KPZ) universality class. However, as in the isotropic XXX model, an analysis of higher-order fluctuations -- specifically the excess kurtosis -- reveals clear deviations from KPZ scaling, signaling anomalous behavior beyond this universality.