Regensburg 2025 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
TT: Fachverband Tiefe Temperaturen
TT 3: Correlated Magnetism – General
TT 3.2: Talk
Monday, March 17, 2025, 09:45–10:00, H32
Hidden quantum correlations in the ground states of quasiclassical spin systems — •Levente Rózsa1,2, Dennis Wuhrer3, Sebastián A. Díaz3, Ulrich Nowak3, and Wolfgang Belzig3 — 1HUN-REN Wigner Research Centre for Physics, Budapest, Hungary — 2Budapest University of Technology and Economics, Budapest, Hungary — 3University of Konstanz, Konstanz, Germany
Entanglement is a unique property of quantum systems, which is widely studied in strongly correlated materials and in quantum information theory. Here, we investigate the entanglement between magnons, the quanta of spin waves, around a classical spin-spiral ground state stabilized by frustrated exchange interactions [1]. We find that the entanglement between pairs of sites completely vanishes in certain parameter regimes, where quantum correlations can only be observed in multi-site clusters. We analyze the magnitude and the spatial dependence of the entanglement in the vicinity of classical phase transitions, and discuss the role of the symmetries of the ground state.
[1] L. Rózsa et al., arXiv:2411.08394.
Keywords: magnon; entanglement; frustrated magnetism; spin spiral