SKM 2023 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 12: Nonequilibrium Quantum Many-Body Systems I (joint session TT/DY)
DY 12.13: Vortrag
Dienstag, 28. März 2023, 13:00–13:15, HSZ 204
Observation of magnon bound states in the long-range, anisotropic Heisenberg model — Florian Kranzl1, •Stefan Birnkammer2, Manoj Joshi1, Alvise Bastianello2, Rainer Blatt1, Michael Knap2, and Christian Roos1 — 1Universität Innsbruck, Innsbruck, Austria — 2Technische Universität München, Garching, Germany
Over the recent years coherent, time-periodic modulation has been established as a versatile tool for realizing novel Hamiltonians. Using this approach, known as Floquet engineering, we experimentally realize a long-ranged, anisotropic Heisenberg model with tunable interactions in a trapped ion quantum simulator. We demonstrate that the spectrum of the model contains not only single magnon excitations but also composite magnon bound states. For the experimentally realized long-range interactions, the group velocity of magnons is unbounded. Nonetheless, for sufficiently strong interactions we observe bound states of these unconventional magnons which possess a non-diverging group velocity. By measuring the configurational mutual information between two disjoint intervals, we demonstrate the implications of the bound state formation on the entanglement dynamics of the system. Our observations provide key insights into the peculiar role of composite excitations in the non-equilibrium dynamics of quantum many-body systems.