Regensburg 2025 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 31: Focus Session: Nonequilibrium Collective Behavior in Open Classical and Quantum Systems
DY 31.5: Talk
Thursday, March 20, 2025, 10:30–10:45, H37
Hydrodynamic description of emergent long-range coherence in active quantum flocks — •Byjesh N Radhakrishnan1,2, Thomas L. Schmidt1, and Markus Heyl2 — 1Department of Physics and Material science, University of Luxembourg — 2Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany
The quantum analog of classical active matter flocking has recently been reported in [arXiv:2308.01603]. The reported model introduces the concept of active quantum matter in a system of hard-core bosons in a one-dimensional lattice. The results provide both analytical and large-scale numerical evidence that these systems can give rise to quantum flocks due to the interplay of spin-flipping and alignment interactions. One of the key findings is that these flocks, unlike classical ones, exhibit distinct quantum properties by developing strong quantum coherence over long distances. Our work focuses mainly on developing a hydrodynamics description to study the origin and properties of this long-range quantum coherence. We systematically explore the relationship between long-range coherence and system parameters like alignment strength and quantum amplitude and compare our analytical results with large-scale numerical simulations.
Keywords: Quantum active matter; non-equilibrium systems; active flocking