SAMOP 2021 – scientific programme
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A: Fachverband Atomphysik
A 16: Ultra-cold atoms, ions, and BEC (joint session A/Q)
A 16.17: Poster
Wednesday, September 22, 2021, 16:30–18:30, P
Quantum gas microscopy of Kardar-Parisi-Zhang superdiffusion — •David Wei1,2, Antonio Rubio-Abadal1,2, Bingtian Ye3, Francisco Machado3,4, Jack Kemp3, Kritsana Srakaew1,2, Simon Hollerith1,2, Jun Rui1,2, Sarang Gopalakrishnan5,6, Norman Y. Yao3,4, Immanuel Bloch1,2,7, and Johannes Zeiher1,2 — 1Max-Planck-Institut für Quantenoptik, Garching, Germany — 2Munich Center for Quantum Science and Technology, Germany — 3University of California, Berkeley, USA — 4Lawrence Berkeley National Laboratory, California, USA — 5The Pennsylvania State University, Pennsylvania, USA — 6College of Staten Island, New York, USA — 7Ludwig-Maximilians-Universität, Munich, Germany
The Kardar-Parisi-Zhang universality class describes the coarse-grained dynamics of numerous classical stochastic models. Surprisingly, the emergent hydrodynamics of spin transport in the one-dimensional (1D) quantum Heisenberg model was recently conjectured to fall into this class. We test this conjecture experimentally in a cold-atom quantum simulator in spin chains of up to 50 spins by studying the relaxation of domain walls. We find that domain-wall relaxation indeed scales with the superdiffusive KPZ dynamical exponent z=3/2. By probing dynamics in 2D and by adding a net magnetization, we verify that superdiffusion requires both integrability and a non-abelian SU(2) symmetry. Finally, we leverage the single-spin-sensitive detection enabled by our quantum-gas microscope to measure spin-transport statistics, which yields a clear signature of the non-linearity that is a hallmark of KPZ universality.