"Quasi-particle breakdown" in the quasi-one-dimensional Ising ferromagnet CoNb${}_2$O${}_6$

Abstract

We present experimental and theoretical evidence that an interesting quantum many-body effect -- quasi-particle breakdown -- occurs in the quasi-one-dimensional spin-1/2 Ising-like ferromagnet CoNb${}_2$O${}_6$ in its paramagnetic phase at high transverse field as a result of explicit breaking of spin inversion symmetry. We propose a quantum spin Hamiltonian capturing the essential one-dimensional physics of CoNb${}_2$O${}_6$ and determine the exchange parameters of this model by fitting the calculated single particle dispersion to the one observed experimentally in applied transverse magnetic fields. We present high-resolution inelastic neutron scattering measurements of the single particle dispersion which observe "anomalous broadening" effects over a narrow energy range at intermediate energies. We propose that this effect originates from the decay of the one particle mode into two-particle states. This decay arises from (i) a finite overlap between the one-particle dispersion and the two-particle continuum in a narrow energy-momentum range and (ii) a small misalignment of the applied field away from the direction perpendicular to the Ising axis in the experiments, which allows for non-zero matrix elements for decay by breaking the ${\mathbb{Z}}_2$ spin inversion symmetry of the Hamiltonian.

arXiv commentv1: 15 pages, 10 figures. v2: 16 pages, 10 figures, minor changes, as accepted to PRB

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• Thermal control of spin excitations in the coupled Ising-chain material RbCoCl3
• Tuning the confinement potential between spinons in the Ising chain CoNb2O6 using longitudinal fields and quantitative determination of the microscopic Hamiltonian
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• Shedding Light on Microscopic Details: 2D Spectroscopy of 1D Quantum Ising Magnets
• The Saga of $\alpha$-RuCl${}_3$: Parameters, Models, and Phase Diagrams
• Magnon interactions in the quantum paramagnetic phase of CoNb${}_2$O${}_6$
• Magnetic order in the quasi-one-dimensional Ising system RbCoCl${}_3$
• Local dynamics and thermal activation in the transverse-field Ising chain
• Breakdown of long-wavelength magnons in cubic antiferromagnets with dipolar forces at small temperature
• Quantum quench in a driven Ising chain
• Interacting triplons in frustrated spin ladders: Binding and decay in BiCu${}_2$PO${}_6$
• Magnon-bound-state hierarchy for the two-dimensional transverse-field Ising model in the ordered phase
• Signatures of Domain-Wall Confinement in Raman Spectroscopy of Ising Spin Chains
• Possibility of hole confinement in the weak coupling regime of one dimensional ising antiferromagnet and the emergence of spin-charge separation in the bulk limit