SAMOP 2021 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 11: Quantum Information (joint session QI/Q)
Q 11.1: Poster
Mittwoch, 22. September 2021, 16:30–18:30, P
Does a disordered isolated Heisenberg spin system thermalize? — •Titus Franz1, Adrien Signoles2, Renato Ferracini Alves1, Clément Hainaut1, Sebastian Geier1, Andre Salzinger1, Annika Tebben1, Shannon Whitlock3, Gerhard Zürn1, Martin Gärttner4, and Matthias Weidemüller1 — 1Physikalisches Institut, Universität Heidelberg, 69120 Heidelberg, Germany — 2Pasqal, 91120 Palaiseau, France — 3IPCMS and ISIS, University of Strasbourg and CNRS, 67000 Strasbourg, France — 4Kirchhoff-Institut für Physik, Universität Heidelberg, 69120 Heidelberg, Germany
The far-from equilibrium dynamics of generic disordered systems is expected to show thermalization, but this process is yet not well understood and shows a rich phenomenology ranging from anomalously slow relaxation to the breakdown of thermalization. While this problem is notoriously difficult to study numerically, we can experimentally probe the relaxation dynamics in an isolated spin system realized by a frozen gas of Rydberg atoms. By breaking the symmetry of the Hamiltonian with an external field, we can identify characteristics of the long time magnetization, including a non-analytic behavior at zero field. These can be understood from mean field, perturbative, and spectral arguments. The emergence of these distinctive features seem to disagree with Eigenstate Thermalization Hypothesis (ETH), which indicates that either a better theoretical understanding of thermalization is required or ETH breaks for the here studied quench in a disordered spin system.