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A: Fachverband Atomphysik

A 21: Ultracold plasmas and Rydberg systems I (joint session Q/A)

A 21.6: Vortrag

Mittwoch, 11. März 2020, 15:15–15:30, f342

Does a disordered Heisenberg spin system thermalize under explicit symmetry breaking? — •Titus Franz¹, Martin Gärttner², Adrien Signoles³, Renato Ferracini Alves¹, André Salzinger¹, Annika Tebben¹, Sebastian Geier¹, David Grimshandl¹, Carlos Brandl¹, Clément Hainaut¹, Gerhard Zürn¹, and Matthias Weidemüller^{1, 4} — ¹Physikalisches Institut, Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg — ²Kirchhoff-Institut für Physik, Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg — ³Laboratoire Charles Fabry, Institut d'Optique Fraduate School, CNRS, Universite Paris-Saclay, 91127 Palaiseau cedex, France — ⁴Shanghai Branch, University of Science and Technology of China, Shanghai 201315, China

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 allows to falsify whether the experiment satisfies Eigenstate Thermalization Hypothesis (ETH).