E-8 Spectra of Quasi-One-Dimensional Antiferromagnet BaCo2V2O8 under Transverse Field

Zou, Haiyuan and Cui, Yi and Wang, Xiao and Zhang, Z. and Yang, J. and Kormos, Márton (2021) E-8 Spectra of Quasi-One-Dimensional Antiferromagnet BaCo2V2O8 under Transverse Field. PHYSICAL REVIEW LETTERS, 127 (7). ISSN 0031-9007

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Abstract

We report V-51 NMR and inelastic neutron scattering (INS) measurements on a quasi-1D antiferromagnet BaCo2V2O8 under transverse field along the [010] direction. The scaling behavior of the spin-lattice relaxation rate above the Neel temperatures unveils a 1D quantum critical point (QCP) at H-c(1D) approximate to 4.7 T, which is masked by the 3D magnetic order. With the aid of accurate analytical analysis and numerical calculations, we show that the zone center INS spectrum at H-c(1D) c is precisely described by the pattern of the 1D quantum Ising model in a magnetic field, a class of universality described in terms of the exceptional E-8 Lie algebra. These excitations are nondiffusive over a certain field range when the system is away from the 1D QCP. Our results provide an unambiguous experimental realization of the massive E-8 phase in the compound, and open a new experimental route for exploring the dynamics of quantum integrable systems as well as physics beyond integrability.

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