Spin dynamics of the $E_8$ particles

Abstract

In this article, we report on inelastic neutron scattering measurements on a quasi-1D antiferromagnet BaCo${}_2$V${}_2$O${}_8$ under a transverse magnetic field applied along the (0,1,0) direction. Combining results of inelastic neutron scattering experiments, analytical analysis, and numerical simulations, we precisely studied the $E_8$ excitations appearing in the whole Brillouin zone at $B_c^{1D}\approx 4.7$ T. The energy scan at $Q=(0,0,2)$ reveals a match between the data and the theoretical prediction of energies of multiple $E_8$ excitations. Furthermore, dispersions of the lightest three $E_8$ particles have been clearly observed, confirming the existence of the $E_8$ particles in BaCo${}_2$V${}_2$O${}_8$. Our results lay down a concrete ground to systematically study the physics of the exotic $E_8$ particles.

arXiv comment10 pages, 4 figures

References in corpus (8)

• Quantum criticality in an Ising chain: experimental evidence for emergent E8 symmetry
• Topological quantum phase transition in the Ising-like antiferromagnetic spin chain BaCo${}_2$V${}_2$O${}_8$
• $E_8$ Spectra of Quasi-one-dimensional Antiferromagnet BaCo${}_2$V${}_2$O${}_8$ under Transverse Field
• Observation of E8 Particles in an Ising Chain Antiferromagnet
• Magnetic phase diagrams, domain switching and a quantum phase transition of the quasi-1D Ising-like antiferromagnet BaCo2V2O8
• Glide symmetry breaking and Ising criticality in the quasi-1D magnet CoNb${}_2$O${}_6$
• Experimental Observation of Quantum Many-Body Excitations of $E_8$ Symmetry in the Ising Chain Ferromagnet CoNb${}_2$O${}_6$
• Cascade of singularities in the spin dynamics of a perturbed quantum critical Ising chain

Cited by in corpus (7)

• Magnetization oscillations in a periodically driven transverse field Ising chain
• Mesons in a quantum Ising ladder
• Signatures of Domain-Wall Confinement in Raman Spectroscopy of Ising Spin Chains
• Spin dynamics and dark particle in a weak-coupled quantum Ising ladder with ${\mathcal{D}}_8^{(1)}$ spectrum
• Berry connection and quantum geometry in time-dependent systems with instantaneous quantum integrable field theory
• Thermally activated detection of dark particles in a weakly coupled quantum Ising ladder
• Emergent $D_8^{(1)}$ spectrum and topological soliton excitation in CoNb${}_2$O${}_6$