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Self-organized magnon condensation in quasi-one-dimensional edge-shared cuprates without external magnetic field

Cliò Efthimia Agrapidis1,*, Stefan-Ludwig Drechsler2,†, and Satoshi Nishimoto3,4,‡

  • 1Institute of Theoretical Physics, Faculty of Physics, University of Warsaw, Pasteura 5, PL-02093 Warsaw, Poland
  • 2Institute for Theoretical Solid State Physics, IFW Dresden, 01171 Dresden, Germany
  • 3Department of Physics, Technical University Dresden, 01069 Dresden, Germany
  • 4Institute for Theoretical Solid State Physics, IFW Dresden, 01171 Dresden, Germany

  • *Contact author: clio.agrapidis@fuw.edu.pl
  • †Contact author: s.l.drechsler@ifw-dresden.de
  • ‡Contact author: s.nishimoto@ifw-dresden.de
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Phys. Rev. Research 7, 043051 – Published 15 October, 2025

DOI: https://doi.org/10.1103/gx4w-3rvh

Abstract

Multimagnon bound states were predicted nearly a century ago and have since been a key topic in condensed matter physics due to their intriguing quantum properties. However, their realization in natural materials remains elusive, especially in low-dimensional quantum magnets, where stabilizing them is particularly challenging due to the traditionally required extremely high external magnetic fields near or below presently available experimentally achieved fields using pulsed techniques in spite of corresponding resolution problems. However, these difficulties may be circumvented considering the much easier and convenient experimental case of ambient external magnetic fields. Therefore, we introduce a mechanism that enables the stabilization of multimagnon bound states in quasi-one-dimensional edge-shared cuprates. Our theoretical framework, supported by numerical simulations and experimental data, demonstrates that small antiferromagnetic interchain couplings act as effective internal magnetic fields, promoting a collinear antiferromagnetic order and enabling magnon condensation even at zero external field. This intrinsic stabilization mechanism eliminates the need for high external fields, offering a platform that is more accessible for experimental realization. We validate this concept by applying it to representative materials such as Li2CuO2, Ca2Y2Cu5O10, LiCuSbO4, and PbCuSO4(OH)2. Beyond its experimental feasibility, this mechanism could drive advancements in magnon-based quantum computing, low-power spintronic devices, and high-speed magnonic circuits. Moreover, our findings reveal that small interchain and/or interlayer couplings can generally unlock previously overlooked magnetic phenomena, redefining the nature of magnetically ordered states and expanding the frontiers of quantum magnetism.

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Phys. Rev. Research 7, 043051– Published 15 October, 2025
  • Received 26 November 2024
  • Accepted 8 August 2025
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