Experimental observation of repulsively bound magnons

Article Article scientifique Article Experimental observation of repulsively bound magnons eng 2024-06-26 2024-07-25 author Wang Zhe 0000-0001-7464-5408 Department of Physics, TU Dortmund University, Dortmund, Germany. zhe.wang@tu-dortmund.de.,Institute of Physics II, University of Cologne, Cologne, Germany. zhe.wang@tu-dortmund.de.,Experimental Physics V, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, Augsburg, Germany. zhe.wang@tu-dortmund.de. author Halati Catalin-Mihai 0000-0002-8344-5595 Department of Quantum Matter Physics, University of Geneva, Geneva, Switzerland.,Physikalisches Institut, University of Bonn, Bonn, Germany. 974133 Département de physique de la matière quantique (FIMAC) author Bernier Jean-Sébastien Physikalisches Institut, University of Bonn, Bonn, Germany.,Department of Physics, University of Northern British Columbia, Prince George, British Columbia, Canada. author Ponomaryov Alexey Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden, Germany.,Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden, Germany. author Gorbunov Denis I Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden, Germany. author Niesen Sandra 0000-0002-0425-8493 Institute of Physics II, University of Cologne, Cologne, Germany. author Breunig Oliver 0000-0001-8651-1757 Institute of Physics II, University of Cologne, Cologne, Germany. author Klopf J Michael 0000-0002-3431-6666 Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden, Germany. author Zvyagin Sergei 0000-0003-0994-7383 Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden, Germany. author Lorenz Thomas 0000-0003-4832-5157 Institute of Physics II, University of Cologne, Cologne, Germany. author Loidl Alois 0000-0002-5579-0746 Experimental Physics V, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, Augsburg, Germany. author Kollath Corinna Physikalisches Institut, University of Bonn, Bonn, Germany. 760-764 10.1038/s41586-024-07599-3 38926581 0028-0836 https://www.nature.com/articles/s41586-024-07599-3 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 lattices1 . 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 BaCo2 V2 O8 . In large transverse fields, below the quantum critical point, we identify repulsively bound magnon states by comparing terahertz spectroscopy measurements to theoretical results for the Heisenberg-Ising chain antiferromagnet, a paradigmatic quantum many-body model2-5 . Our experimental results show that these high-energy, repulsively bound magnon states are well separated from continua, exhibit notable dynamical responses and, despite dissipation, are sufficiently long-lived to be identified. As the transport properties in spin chains can be altered by magnon bound states, we envision that such states could serve as resources for magnonics-based quantum information processing technologies6-8 . Dewey 500.2 33 Département de physique de la matière quantique 131 false 780 Groupe Giamarchi Nature 631 8022 1c342ec0-d76e-42df-97fd-db5c01c74987 Article (Published version) Restricted Article_scientifique_from_crossref.pdf 3335079 application/pdf 1baab4ec2ad42a5d27d27930c1ffaa2cc02c1450ac622428f6a005f306d45c98 restrictedAccess Faculté des sciences / Section de physique / Département de physique de la matière quantique

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