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TT: Fachverband Tiefe Temperaturen

TT 15: Quantum Coherence and Quantum Information Systems (joint session TT/DY)

TT 15.13: Vortrag

Dienstag, 18. März 2025, 13:00–13:15, H31

Zero-temperature magnon-mediated long-range entanglement in Heisenberg chain with magnetic impurity — •Marius Melz and Jamal Berakdar — Martin-Luther-Universität Halle -Wittenberg

The understanding of many-body entanglement in solid-state systems is of interest both for fundamental and practical reasons. In this work, a spin-1/2 Heisenberg chain is coupled to a chiral magnetic impurity, acting as a magnon scatterer. The spatial entanglement structure of the ground state and its effect on the propagation of local magnons is characterized by the spatially resolved bipartition entropy and logarithmic negativity. The ground state exhibits an entanglement transition at a critical magnetic bias field. We find that magnon scattering generates steady-state long-range entanglement between two scattering regions. Furthermore, it is demonstrated that this effect is significantly amplified in the high-entanglement phase.

Keywords: Entanglement; Magnon scattering; Heisenberg model