Quantum gas microscopy of Kardar-Parisi-Zhang superdiffusion

Wei, David; Rubio-Abadal, Antonio; Ye, Bingtian; Machado, Francisco; Kemp, Jack; Srakaew, Kritsana; Hollerith, Simon; Rui, Jun; Gopalakrishnan, Sarang; Yao, Norman Y.; Bloch, Immanuel und Zeiher, Johannes (2022): Quantum gas microscopy of Kardar-Parisi-Zhang superdiffusion. In: Science, Bd. 376, Nr. 6594: S. 716-720

Abstract

The Kardar-Parisi-Zhang (KPZ) universality class describes the coarse-grained behavior of a wealth of classical stochastic models. Surprisingly, KPZ universality was recently conjectured to also describe spin transport in the one-dimensional quantum Heisenberg model. We tested this conjecture by experimentally probing transport in a cold-atom quantum simulator via the relaxation of domain walls in spin chains of up to 50 spins. We found that domain-wall relaxation is indeed governed by the KPZ dynamical exponent z = 3/2 and that the occurrence of KPZ scaling requires both integrability and a nonabelian SU(2) symmetry. Finally, we leveraged the single-spin-sensitive detection enabled by the quantum gas microscope to measure an observable based on spin-transport statistics. Our results yield a clear signature of the nonlinearity that is a hallmark of KPZ universality.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 0036-8075
• Sprache: Englisch
• DFG: Gefördert durch die Deutsche Forschungsgemeinschaft (DFG) - 390814868