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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, 21Physikalisches 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.

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