Experimental observation of repulsively bound magnons

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 BaCo${}_2$V${}_2$O${}_8$. 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 model. Our experimental results show that these high-energy repulsively bound magnon states are well separated from continua, exhibit significant 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 such states could serve as resources for magnonics based quantum information processing technologies.

27 pages, 4 + 5 figures, accepted version

References in corpus (28)

• The density-matrix renormalization group in the age of matrix product states
• Real time evolution using the density matrix renormalization group
• Time-dependent density-matrix renormalization-group using adaptive effective Hilbert spaces
• The ITensor Software Library for Tensor Network Calculations
• Quantum Quench in the Transverse Field Ising Chain
• Quantum magnonics: when magnon spintronics meets quantum information science
• Repulsively bound atom pairs in an optical lattice
• Fractional spinon excitations in the quantum Heisenberg antiferromagnetic chain
• The Quench Action
• Entanglement dynamics and quantum state transport in spin chains
• Nonthermal states arising from confinement in one and two dimensions
• Observation of Domain Wall Confinement and Dynamics in a Quantum Simulator
• Extended quantum critical phase in a magnetized spin-1/2 antiferromagnetic chain
• Topological quantum phase transition in the Ising-like antiferromagnetic spin chain BaCo${}_2$V${}_2$O${}_8$
• Longitudinal and Transverse Zeeman Ladders in the Ising-Like Chain Antiferromagnet BaCo2V2O8
• Novel ordering of an S = 1/2 quasi one-dimensional Ising-like anitiferromagnet in magnetic field
• Orbital-Exchange and Fractional Quantum Number Excitations in an f-electron Metal Yb${}_2$Pt${}_2$Pb
• The anisotropic Heisenberg model in a transverse magnetic field
• Quantum Criticality of an Ising-like Spin-1/2 Antiferromagnetic Chain in Transverse Magnetic Field
• THz-range free-electron laser ESR spectroscopy: techniques and applications in high magnetic fields
• Quantum Critical Dynamics of a Heisenberg-Ising Chain in a Longitudinal Field: Many-Body Strings versus Fractional Excitations
• Magnetic phase diagrams, domain switching and a quantum phase transition of the quasi-1D Ising-like antiferromagnet BaCo2V2O8
• Field-induced magnetic behavior in quasi-one-dimensional Ising-like antiferromagnet BaCo2V2O8: A single-crystal neutron diffraction study
• Tomonaga-Luttinger liquid spin dynamics in the quasi-one dimensional Ising-like antiferromagnet BaCo${}_2$V${}_2$O${}_8$
• Substitution effects on the temperature vs. magnetic-field phase diagrams of the quasi-1D effective Ising spin-1/2 chain system BaCo${}_2$V${}_2$O${}_8$
• Dynamics and symmetries of a repulsively bound atom pair in an infinite optical lattice
• Topological transition between competing orders in quantum spin chains
• Repulsively bound magnon excitations of a spin-1/2 XXZ chain in a staggered transverse field

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• Quantum spin dynamics of the honeycomb magnet K${}_2$Co${}_2$TeO${}_6$ in high magnetic fields
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