Macroscopic friction and viscosity in isolated quantum spin chains emerge only after finite temporal coarse-graining of the unitary dynamics, while mechanical elasticity remains present at all scales.
Transport, collective motion, and brown- ian motion.Progress of Theoretical Physics, 33(3):423– 455
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Temporal Coarse-Graining as the Origin of Macroscopic Friction in Quantum Spin Chains via Data-Driven Liouvillian Extraction
Macroscopic friction and viscosity in isolated quantum spin chains emerge only after finite temporal coarse-graining of the unitary dynamics, while mechanical elasticity remains present at all scales.