Exploring out-of-equilibrium quantum magnetism and thermalization in a spin-3 many-body dipolar lattice system

Author
Abstract
Understanding quantum thermalization through entanglement build\ up in isolated quantum systems addresses fundamental questions on how unitary dynamics connects to statistical physics. Spin systems made of long-range interacting atoms offer an ideal experimental platform to investigate this question. Here, we study the spin dynamics and approach towards local thermal equilibrium of a macroscopic ensemble of\ S\ = 3 chromium atoms pinned in a three dimensional optical lattice and prepared in a pure coherent spin state, under the effect of magnetic dipole\textendashdipole interactions. Our isolated system thermalizes under its own dynamics, reaching a steady state consistent with a thermal ensemble with a temperature dictated from the system\textquoterights energy. The build up of quantum correlations during the dynamics is supported by comparison with an improved numerical quantum phase-space method. Our observations are consistent with a scenario of quantum thermalization linked to the growth of entanglement entropy.
Year of Publication
2019
Journal Title
Nature Communications
Volume
10
Date Published
2019-04
URL
https://www.nature.com/articles/s41467-019-09699-5$\#$Abs1
DOI
10.1038/s41467-019-09699-5
JILA PI
Associated Institutes
Journal Article