MCQST2021 | Observation of KPZ superdiffusion in a Heisenberg quantum magnet (Johannes Zeiher)

Описание: Observation of KPZ superdiffusion in a Heisenberg quantum magnet

Speaker: Johannes Zeiher | MPI of Quantum Optics & MCQST

Abstract
Universality is one of the guiding principles unifying the description of seemingly unrelated physical systems. Kardar-Parisi-Zhang (KPZ) universality is a celebrated example, describing disparate phenomena such as interface growth or propagating shock waves.Recently, KPZ was conjectured to also describe spin transport in one-dimensional Heisenberg quantum magnets.
We probe this conjecture experimentally in a quan tum gas microscope in chains of up to 50 spins, and confirm the expected superdiffusive spin transport predicted by KPZ. Moreover, we probe the mechanisms underlying KPZ: Superdiffusive transport vanishes when breaking SU(2) symmetry or integrability of our system.
Finally, the single-spin sensitivity of our quantum gas microscope enables us to extract spin-transport statistics. By this, we directly confirm the non-linear character underlying KPZ universality in general. Our results raise several interesting questions for future research, regarding, for example, the impact of different initial states on transport dynamics.


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