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A: Fachverband Atomphysik
A 29: Ultra-cold plasmas and Rydberg systems III (joint session A/Q)
A 29.6: Vortrag
Freitag, 13. März 2020, 12:30–12:45, b305
Engineering Rydberg-spin Hamiltonian using microwave pulse sequences — •Sebastian Geier1, Nithiwadee Thaicharoen1, Clement Hainaut1, Titus Franz1, Andre Salzinger1, Annika Tebben1, Carlos Brandl1, David Grimshandl1, Gerhard Zürn1, and Matthias Weidemüller1,2 — 1Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany — 2Shanghai Branch, University of Science and Technology of China, Shanghai 201315, China
We present engineering of general classes of spin Hamiltonians differing from the underlying Rydberg interaction Hamiltonian to experimentally study quantum spin models in an isolated environment. A system of Rydberg atoms in two distinct Rydberg states, interacting via Van der Waals or dipolar interaction, can already be mapped onto a spin system with a Heisenberg XX- and XXZ-Hamiltonian. In order to obtain access to more general classes of XYZ-Hamiltonians, we dynamically engineer terms in the given interaction Hamiltonian using global microwave pulses which couple the two different Rydberg states. With a sequence widely used in nuclear magnetic resonance that is called WAHUHA sequence, we show the ability to transform a system with XX-like interactions into an isotropic XXX-model. Magnetization measurements reveal that this sequence can be used to preserve the magnetization of any arbitrary initial state even if it is far-from-equilibrium. By modifying the delay time between the pulses we implement XXZ-models with different anisotropies and observe their relaxation dynamics.