Rostock 2019 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 42: Poster: Quantum Optics and Photonics II
Q 42.17: Poster
Wednesday, March 13, 2019, 16:15–18:15, S Atrium Informatik
Probing out-of-equilibrium dynamics of Rydberg-spin systems using linear response theory — •Sebastian Geier1, Renato Ferracini Alves1, Titus Franz1, Alexander Müller1, Andre Salzinger1, Annika Tebben1, Nithiwadee Thaicharoen1, Clément Hainaut1, Gerhard Zürn1, and Matthias Weidemüller1, 2 — 1Physikalisches Institut, Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany — 2Shanghai Branch, University of Science and Technology of China, Shanghai 201315, China
Dipolar interacting Rydberg atoms constitute controllable platforms to experimentally study out-of-equilibrium phenomena of many-body spin systems. In our experiment the spin-1/2 degree of freedom is represented by two strongly interacting Rydberg states that are coupled by a microwave field. After quenching the system out-of-equilibrium, our goal is to study the relaxation of this state which can show interesting dynamics towards thermal- or nonthermal-fixed points. In this work linear response theory is used as a tool to characterize these dynamics. Utilizing the microwave field, a small perturbation during the relaxation process is applied and the corresponding linear response function of the magnetization is measured by state-selective field ionization. By comparing the systems fluctuation properties to this response function, violations of the fluctuation-dissipation relation could be identified and used to characterize slow relaxation dynamics.