Experimental observation of repulsively bound magnons
Zhe Wang, Catalin-Mihai Halati, Jean-S\'ebastien Bernier, Alexey, Ponomaryov, Denis I. Gorbunov, Sandra Niesen, Oliver Breunig, J. Michael, Klopf, Sergei Zvyagin, Thomas Lorenz, Alois Loidl, Corinna Kollath

TL;DR
This paper reports the experimental detection of repulsively bound magnon states in a quantum spin chain, demonstrating their stability and potential for quantum information applications.
Contribution
It provides the first spectroscopic evidence of repulsively bound three-magnon states in a condensed matter system, bridging a gap from previous optical lattice experiments.
Findings
Identification of repulsively bound magnon pairs and triplets
Spectroscopic signatures match theoretical models
Bound states are long-lived and distinct from continua
Abstract
Stable composite objects, such as hadrons, nuclei, atoms, molecules and superconducting pairs, formed by attractive forces are ubiquitous in nature. By contrast, composite objects stabilized by means of repulsive forces were long thought to be theoretical constructions owing to their fragility in naturally occurring systems. Surprisingly, the formation of bound atom pairs by strong repulsive interactions has been demonstrated experimentally in optical lattices. Despite this success, repulsively bound particle pairs were believed to have no analogue in condensed matter owing to strong decay channels. Here we present spectroscopic signatures of repulsively bound three-magnon states and bound magnon pairs in the Ising-like chain antiferromagnet BaCoVO. In large transverse fields, below the quantum critical point, we identify repulsively bound magnon states by comparing…
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