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Q: Fachverband Quantenoptik und Photonik
Q 55: Quantum Effects III
Q 55.6: Vortrag
Donnerstag, 17. März 2022, 15:15–15:30, Q-H13
Does a disordered Heisenberg spin system thermalize? — •Titus Franz1, Adrien Signoles2, Adrian Braemer3, Renato Ferracini Alves1, Sebastian Geier1, Annika Tebben1, André Salzinger1, Nithiwadee Thaicharoen1,4, Clément Hainaut1, 5, Gerhard Zürn1, Martin Gärttner1, and Matthias Weidemüller1 — 1Physikalisches Institut, Heidelberg University, Germany — 2Pasqal, France — 3Kirchhoff-Institut für Physik, Heidelberg University, Germany — 4Research Center for Quantum Technology, Chiang Mai University, Thailand — 5Université de Lille, CNRS, UMR 8523 - PhLAM, France
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. The long-time magnetization as a function of a transverse external field shows striking features including non-analytic behavior at zero field. These can be understood from mean-field, perturbative, and spectral arguments. The emergence of these distinctive features seems 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.